Matthew 7:15

Beware--But beware. of false prophets--that is, of teachers coming as authorized expounders of the mind of God and guides to heaven. (See Act 20:29-30; Pe2 2:1-2). which come to you in sheep's clothing--with a bland, gentle, plausible exterior; persuading you that the gate is not strait nor the way narrow, and that to teach so is illiberal and bigoted--precisely what the old prophets did (Eze 13:1-10, Eze 13:22). but inwardly they are ravening wolves--bent on devouring the flock for their own ends (Co2 11:2-3, Co2 11:13-15).

We have here a caution against false prophets, to take heed that we be not deceived and imposed upon by them. Prophets are properly such as foretel things to come; there are some mentioned in the Old Testament, who pretended to that without warrant, and the event disproved their pretensions, as Zedekiah, Kg1 22:11, and another Zedekiah, Jer 29:21. But prophets did also teach the people their duty, so that false prophets here are false teachers. Christ being a Prophet and a Teacher come from God, and designing to send abroad teachers under him, gives warning to all to take heed of counterfeits, who, instead of healing souls with wholesome doctrine, as they pretend, would poison them. They are false teachers and false prophets, 1. Who produce false commissions, who pretend to have immediate warrant and direction from God to set up for prophets, and to be divinely inspired, when they are not so. Though their doctrine may be true, we are to beware of them as false prophets. False apostles are those who say they are apostles, and are not (Rev 2:2); such are false prophets. "Take heed of those who pretend to revelation, and admit them not without sufficient proof, lest that one absurdity being admitted, a thousand follow." 2. Who preach false doctrine in those things that are essential to religion; who teach that which is contrary to the truth as it is in Jesus, to the truth which is accordingly to godliness. The former seems to be the proper notion of pseudo-propheta, a false or pretending prophet, but commonly the latter falls in with it; for who would hang out false colours, but with design, under pretence of them, the more successfully to attack the truth. "Well, beware of them, suspect them, try them, and when you have discovered their falsehood, avoid them, have nothing…

7:15-20 False prophets speak what people want to hear rather than calling people to live according to God’s will. Deuteronomy 13:1-5 and 18:21-22 set standards for evaluating a prophet’s truthfulness: His words must conform to God’s word, and his predictions must come true. Jesus unpacks the first requirement: A prophet’s actions must match his words in order to be believable; accordingly, a true prophet’s actions will also match God’s word. Just as the fruit indicates the nature of a tree, so one’s life indicates either a regenerate or unregenerate heart. False prophets are expected at the end of the age (see Matt 24:11, 24; Acts 20:28-35; Rev 13:11-18; 16:13; 19:20; 20:10). In order not to be deceived, Christians must be discerning (see 1 Cor 12:10; 14:29; 1 Thes 5:21; 1 Jn 4:1-3; Rev 2:20).