When the people of God were gathered together in the solemn day, the day of the feast of the Lord, they must be told that they had business to do, for we do not go to church to sleep nor to be idle; no, there is that which the duty of every day requires, work of the day, which is to be done in its day. And here,

I.The worshippers of God are excited to their work, and are taught, by singing this psalm, to stir up both themselves and one another to it, Psa 81:1-3. Our errand is, to give unto God the glory due unto his name, and in all our religious assemblies we must mind this as our business. 1. In doing this we must eye God as our strength, and as the God of Jacob, Psa 81:1. He is the strength of Israel, as a people; for he is a God in covenant with them, who will powerfully protect, support, and deliver them, who fights their battles and makes them do valiantly and victoriously. He is the strength of every Israelite; by his grace we are enabled to go through all our services, sufferings, and conflicts; and to him, as our strength, we must pray, and we must sing praise to him as the God of all the wrestling seed of Jacob, with whom we have a spiritual communion. 2. We must do this by all the expressions of holy joy and triumph. It was then to be done by musical instruments, the timbrel, harp, and psaltery; and by blowing the trumpet, some think in remembrance of the sound of the trumpet on Mount Sinai, which waxed louder and louder. It was then and is now to be done by singing psalms, singing aloud, and making a joyful noise. The pleasantness of the harp and the awfulness of the trumpet intimate to us that God is to be worshipped with cheerfulness and joy with reverence and godly fear. Singing aloud and making a noise intimate that we must be warm and affectionate in praising God, that we must with a hearty good-will show forth his praise, as those that are not ashamed to own our dependence on him and obligations to him, and that we should join many together in this work; the more the better; it is the more like heaven. 3. This must be done in the time appointed. No time is amiss for praising God (Seven times a day will I praise thee; nay, at midnight will I rise and give thanks unto thee); but some are times appointed, not for God to meet us (he is always ready), but for us to meet one another, that we may join together in praising Do. The solemn feast-day must be a day of praise; when we are receiving the gifts of God's bounty, and rejoicing in them, then it is proper to sing his praises.

II.They are here directed in their work. 1. They must look up to the divine institution which it is the observation of. In all religious worship we must have an eye to the command (Psa 81:4): This was a statute for Israel, for the keeping up of a face of religion among them; it was a law of the God of Jacob, which all the seed of Jacob are bound by, and must be subject to. Note, Praising God is not only a good thing, which we do well to do, but it is our indispensable duty, which we are obliged to do; it is at our peril if we neglect it; and in all religious exercises we must have an eye to the institution as our warrant and rule: "This I do because God has commanded me; and therefore I hope he will accept me;" then it is done in faith. 2. They must look back upon those operations of divine Providence which it is the memorial of. This solemn service was ordained for a testimony (Psa 81:5), a standing traditional evidence, for the attesting of the matters of fact. It was a testimony to Israel, that they might know and remember what God had done for their fathers, and would be a testimony against them if they should be ignorant of them and forget them. (1.) The psalmist, in the people's name, puts himself in mind of the general work of God on Israel's behalf, which was kept in remembrance by this and other solemnities, Psa 81:5. When God went out against the land of Egypt, to lay it waste, that he might force Pharaoh to let Israel go, then he ordained solemn feast-days to be observed by a statute for ever in their generations, as a memorial of it, particularly the passover, which perhaps is meant by the solemn feast-day (Psa 81:3); that was appointed just then when God went out through the land of Egypt to destroy the first-born, and passed over the houses of the Israelites, Exo 12:23, Exo 12:24. By it that work of wonder was to be kept in perpetual remembrance, that all ages might in it behold the goodness and severity of God. The psalmist, speaking for his people, takes notice of this aggravating circumstance of their slavery in Egypt that there they heard a language that they understood not; there they were strangers in a strange land. The Egyptians and the Hebrews understood not one another's language; for Joseph spoke to his brethren by an interpreter (Gen 42:23), and the Egyptians are said to be to the house of Jacob a people of a strange language, Psa 114:1. To make a deliverance appear the more gracious, the more glorious, it is good to observe every thing that makes the trouble we are delivered from appear the more grievous. (2.) The psalmist, in God's name, puts the people in mind of some of the particulars of their deliverance. Here he changes the person, Psa 81:6. God speaks by him, saying, I removed the shoulder from the burden. Let him remember this on the feast-day, [1.] That God had brought them out of the house of bondage, had removed their shoulder from the burden of oppression under which they were ready to sink, had delivered their hands from the pots, or panniers, or baskets, in which they carried clay or bricks. Deliverance out of slavery is a very sensible mercy and one which ought to be had in everlasting remembrance. But this was not all. [2.] God had delivered them at the Red Sea; then they called in trouble, and he rescued them and disappointed the designs of their enemies against them, Exo 14:10. Then he answered them with a real answer, out of the secret place of thunder; that is, out of the pillar of fire, through which God looked upon the host of the Egyptians and troubled it, Exo 14:24, Exo 14:25. Or it may be meant of the giving of the law at Mount Sinai, which was the secret place, for it was death to gaze (Exo 19:21), and it was in thunder that God then spoke. Even the terrors of Sinai were favours to Israel, Deu 4:33. [3.] God had borne their manners in the wilderness: "I proved thee at the waters of Meribah; thou didst there show thy temper, what an unbelieving murmuring people thou wast, and yet I continued my favour to thee." Selah - Mark that; compare God's goodness and man's badness, and they will serve as foils to each other. Now if they, on their solemn feast-days, were thus to call to mind their redemption out of Egypt, much more ought we, on the Christian sabbath, to call to mind a more glorious redemption wrought out for us by Jesus Christ from worse than Egyptian bondage, and the many gracious answers he has given to us, notwithstanding our manifold provocations.

Blow up the trumpet in the new moon,.... Either in every new moon, or first day of the month, which was religiously observed by the Jews, Kg2 4:23 or rather the new moon, or first day of the seventh month, the month Tisri, which day was a memorial of blowing of trumpets, Lev 23:34, and so the Targum,

"blow the trumpet in the month of Tisri,''

when their new year began, and was typical of the year of the redeemed of the Lord, of the acceptable year of our God, of the famous new year, the Gospel dispensation, when old things passed away, and all things became new. The Jews say this blowing of trumpets was in commemoration of Isaac's deliverance, a ram being sacrificed for him, and therefore they sounded with trumpets made of rams' horns; or in remembrance of the trumpet blown at the giving of the law; though it rather was an emblem of the Gospel, and the ministry of it, by which sinners are aroused, awakened and quickened, and souls are charmed and allured, and filled with spiritual joy and gladness:

in the time appointed; so Aben Ezra, Jarchi, and Kimchi, interpret the word of a set fixed time; see Pro 7:20, the word (a) used has the signification of covering; and the former of these understand it of the time just before the change of the moon, when it is covered, which falls in with the former phrase; and so the Targum,

"in the moon that is covered;''

though the Latin interpreter renders it,

"in the month which is covered with the days of our solemnities,''

there being many festivals in the month of Tisri; the blowing of trumpets on the first day of it, the atonement on the tenth, and the feast of tabernacles on the fifteenth. But De Dieu has made it appear, from the use of the word in the Syriac language, that it should be rendered "in the full moon", and so directs to the right understanding of the feast next mentioned;

on our solemn feast day, which must design a feast which was at the full of the moon; and so must be either the feast of the passover, which was on the fourteenth day of the month Nisan, and was a type of Christ our Passover, sacrificed for us, on which account we should keep the feast, Exo 12:6, or else the feast of tabernacles, which was on the fifteenth of the month Tisri, kept in commemoration of the Israelites dwelling in booths, Lev 23:34 and which is called the feast, and the solemn feast, emphatically; see Kg1 8:2, and was typical of the state of God's people in this world, who dwell in the earthly houses of their tabernacles, and have no continuing city; and of the churches of Christ, which are the tabernacles in which God and his people dwell, and will abide in this form but for a time, and are moveable; and also of Christ's tabernacling in human nature, Joh 1:14.

(a) "quum tegitur luna", Piscator; "ad verbum in obtectione", i. e. "eum obtegatur luna a sole", Amama.