Here the apostle informs us what foundation he had laid at the bottom of all his labours among them - even Jesus Christ, the chief corner-stone, Eph 2:20. Upon this foundation all the faithful ministers of Christ build. Upon this rock all the Christians found their hopes. Those that build their hopes of heaven on any other foundation build upon the sand. Other foundation can no man lay besides what is laid - even Jesus Christ. Note, The doctrine of our Saviour and his mediation is the principal doctrine of Christianity. It lies at the bottom, and is the foundation, of all the rest. Leave out this, and you lay waste all our comforts, and leave no foundation for our hopes as sinners. It is in Christ only that God is reconciling a sinful world to himself, Co2 5:19. But of those that hold the foundation, and embrace the general doctrine of Christ's being the mediator between God and man, there are two sorts: -

I.Some build upon this foundation gold, silver, and precious stones (Co1 3:12), namely, those who receive and propagate the pure truths of the gospel, who hold nothing but the truth as it is in Jesus, and preach nothing else. This is building well upon a good foundation, making all of apiece, when ministers not only depend upon Christ as the great prophet of the church, and take him for their guide and infallible teacher, but receive and spread the doctrines he taught, in their purity, without any corrupt mixtures, without adding or diminishing.

II.Others build wood, hay, and stubble, on this foundation; that is, though they adhere to the foundation, they depart from the mind of Christ in many particulars, substitute their own fancies and inventions in the room of his doctrines and institutions, and build upon the good foundation what will not abide the test when the day of trial shall come, and the fire must make it manifest, as wood, hay, and stubble, will not bear the trial by fire, but must be consumed in it. There is a time coming when a discovery will be made of what men have built on this foundation: Every man's work shall be made manifest, shall be laid open to view, to his own view and that of others. Some may, in the simplicity of their hearts, build wood and stubble on the good foundation, and know not, all the while, what they have been doing; but in the day of the Lord their own conduct shall appear to them in its proper light. Every man's work shall be made manifest to himself, and made manifest to others, both those that have been misled by him and those that have escaped his errors. Now we may be mistaken in ourselves and others; but there is a day coming that will cure all our mistakes, and show us ourselves, and show us our actions in the true light, without covering or disguise: For the day shall declare it (that is, every man's work), because it shall be revealed by fire; and the fire shall try every man's work, of what sort it is, Co1 3:13. The day shall declare and make it manifest, the last day, the great day of trial; see Co1 4:5. Though some understand it of the time when the Jewish nation was destroyed and their constitution thereby abolished, when the superstructure which judaizing teachers would have raised on the Christian foundation was manifested to be no better than hay and stubble, that would not bear the trial. The expression carries in it a plain allusion to the refiner's art, in which the fire separates and distinguishes the dross from the gold and silver; as it also will silver and gold and precious stones, that will endure the fire, from wood and hay and stubble, that will be consumed in it. Note, There is a day coming that will as nicely distinguish one man from another, and one man's work from another's, as the fire distinguishes gold from dross, or metal that will bear the fire from other materials that will be consumed in it. In that day, 1. Some men's works will abide the trial - will be found standard. It will appear that they not only held the foundation, but that they built regularly and well upon it - that they laid on proper materials, and in due form and order. The foundation and the superstructure were all of a piece. The foundation-truths, and those that had a manifest connection with them, were taught together. It may not be so easy to discern this connection now, nor know what works will abide the trial then; but that day will make a full discovery. And such a builder shall not, cannot fail of a reward. He will have praise and honour in that day, and eternal recompence after it. Note, Fidelity in the ministers of Christ will meet with a full and ample reward in a future life. Those who spread true and pure religion in all the branches of it, and whose work will abide in the great day, shall receive a reward. And, Lord, how great! how much exceeding their deserts! 2. There are others whose works shall be burnt (Co1 3:15), whose corrupt opinions and doctrines, or vain inventions and usages in the worship of God, shall be discovered, disowned, and rejected, in that day - shall be first manifested to be corrupt, and then disapproved of God and rejected. Note, The great day will pluck off all disguises, and make things appear as they are: He whose work shall be burnt will suffer loss. If he have built upon the right foundation wood and hay and stubble, he will suffer loss. His weakness and corruption will be the lessening of his glory, though he may in the general have been an honest and an upright Christian. This part of his work will be lost, turning no way to his advantage, though he himself may be saved. Observe, Those who hold the foundation of Christianity, though they build hay, wood, and stubble, upon it, may be saved. This may help to enlarge our charity. We should not reprobate men for their weakness: for nothing will damn men but wickedness. He shall be saved, yet so as by fire, saved out of the fire. He himself shall be snatched out of that flame which will consume his work. This intimates that it will be difficult for those that corrupt and deprave Christianity to be saved. God will have no mercy on their works, though he may pluck them as brands out of the burning. On this passage of scripture the papists found their doctrine of purgatory, which is certainly hay and stubble: a doctrine never originally fetched from scripture, but invented in barbarous ages, to feed the avarice and ambition of the clergy, at the cost of those who would rather part with their money than their lusts, for the salvation of their souls. It can have no countenance from this text, (1.) Because this is plainly meant of a figurative fire, not of a real one: for what real fire can consume religious rites or doctrines? (2.) Because this fire is to try men's works, of what sort they are; but purgatory-fire is not for trial, not to bring men's actions to the test, but to punish for them. They are supposed to be venial sins, not satisfied for in this life, for which satisfaction must be made by suffering the fire of purgatory. (3.) Because this fire is to try every man's works, those of Paul and Apollos, as well as those of others. Now, no papists will have the front to say apostles must have passed through purgatory fires.

If any man's work abide - Perhaps there is here an allusion to the purifying of different sorts of vessels under the law. All that could stand the fire were to be purified by the fire; and those which could not resist the action of the fire were to be purified by water, Num 31:23. The gold, silver, and precious stones, could stand the fire; but the wood, hay, and stubble, must be necessarily consumed. So, in that great and terrible day of the Lord, all false doctrine, as well as the system that was to pass away, should be made sufficiently manifest; and God would then show that the Gospel, and that alone, was that system of doctrine which he should bless and protect, and none other.

He shall receive a reward - He has not only preached the truth, but he has labored in the word and doctrine. And the reward is to be according to the labor. See on Co1 3:8 (note).

If any man's work abide,.... That is, if any minister's doctrine will bear the test of daylight, to be looked into, and abide the fire of the word; as gold, silver, and precious stones will, or such doctrines as are comparable to them, which will shine the brighter for being tried by this fire:

which he hath built thereupon; upon the foundation Christ, in entire consistence with, and proportion to it, and highly becoming it:

he shall receive a reward; either from the churches of Christ here, who shall honour and respect him for his faithful labours in the ministry; or from Christ hereafter, who will say, well done, good and faithful servant, enter thou into the joy of thy Lord.

abide--abide the testing fire (Mat 3:11-12).

which he hath built thereupon--which he built on the foundation.

reward--wages, as a builder, that is, teacher. His converts built on Christ the foundation, through his faithful teaching, shall be his "crown of rejoicing" (Co2 1:14; Phi 2:16; Th1 2:19).