In the foregoing verse the thoughts of the wicked and righteous were compared; here their words, and those are as the abundance of the heart is. 1. Wicked people speak mischief to their neighbours; and wicked indeed those are whose words are to lie in wait for blood; their tongues are swords to those that stand in their way, to good men whom they hate and persecute. See an instance, Luk 20:20, Luk 20:21. 2. Good men speak help to their neighbours: The mouth of the upright is ready to be opened in the cause of those that are oppressed (Pro 31:8), to plead for them, to witness for them, and so to deliver them, particularly those whom the wicked lie in wait for. A man may sometimes do a very good work with one good word.

The words of the wicked are to lie in wait for blood,.... Which some understand of perjury and false witness, as Jarchi, whereby the lives of innocent persons are taken away: or it may be interpreted either of the smooth words and fair speeches, and secret artifices, antichrist and his emissaries make use of to entrap the innocent, and draw them into their net, to their ruin; see Psa 10:7; as the Jews attempted to deal with Christ, Luk 20:20; or of the laws and edicts of the beast, that such should be killed who would not worship his image; and with the blood of these innocent ones the whore of Rome is said to be drunk, Rev 13:15;

but the mouth of the upright shall deliver them: the innocent laid in wait for; either by their prayers to God, which are of great avail with him, and through whose importunity he will avenge his elect, and deliver them; or through their apologies for them, and defences of them, as in the times of Pagan persecution; or rather through the doctrines of the reformation, whereby many simple and unwary souls were delivered, who were in danger of being ensnared; and whereby the eyes of many princes were opened, and were stirred up to protect those innocent ones, and prevent their blood being shed.

The words--or, "expressed designs" of the wicked are for evil purposes.

the mouth--or, "words" of the righteous delivering instead of ensnaring men.