Then will many be offended. He now enumerates the temptations which will arise from bad examples. Now this is an exceedingly violent temptation, and difficult to overcome; for Christ is to many a stone of offense, (1-Peter 2:8,) on which some dash themselves, or by meeting which some are thrown back, and others fall away. In this expression Christ appears to me to include many kinds of troubles; for not only do they that had entered into the right course fall away, but many are exasperated against Christ; others, forgetful of moderation and justice, break out into rage; others grow profane, and lose every feeling of piety; and others, amidst the confusion which prevails, take upon themselves a liberty to commit crimes.

Many shall be offended - See the notes at Matthew 5:29. Many shall stumble, fall, apostatize from a profession of religion. Many who "professed" to love me will then show that they had no "real" attachment to me; and in those trying times it will be seen that they knew nothing of genuine Christian love. See 1-John 2:19.
Shall betray one another - Those who thus apostatize from professed attachment to me will betray others who really love me. This they would do to secure their own safety, by revealing the names, habitations, or places of concealment of others.
Shall hate one another - Not that real Christians would do this, but those who had professed to be such would then show that they were not his true followers, and would hate one another. Luke adds that they should be betrayed "by parents, and brethren, and kinsfolks, and friends," Luke 21:16. They would break over the most tender ties to surrender Christians to punishment. So great would be their hatred of Christianity, that it would overcome all the natural endearments of kindred and home. This, in the persecutions of Christians, has often occurred, and nothing shows more fully the deep and deadly hatred of the human heart to the gospel. Compare the notes at Matthew 10:21.

Then shall many be offended, and shall betray one another - To illustrate this point, one sentence out of Tacitus (Annal. l. xv). will be sufficient, who, speaking of the persecution under Nero, says, At first several were seized, who confessed, and then by Their Discovery a great multitude of others were convicted and executed.

And then shall many be offended,.... That is, many who had been hearers of the apostles, and professors of the Christian religion; who were highly pleased with it, and were strenuous advocates for it, whilst things were tolerably quiet and easy; but when they saw the apostles, some of them beaten, and imprisoned; others put to death, and others forced to fly from place to place; and persecutions and affliction, because of Christ and his Gospel, likely to befall themselves, would be discouraged hereby, and stumble at the cross; and fall off from the faith of the Gospel, and the profession of it:
and shall betray one another; meaning, that the apostates, who would fall off from the Christian religion, would prove treacherous to true believers, and give in their names to the persecutors, or inform them where they were, that they might take them, or deliver them into their hands themselves: these are the false brethren, the Apostle Paul was in perils among:
and shall hate one another; not that the true Christians should hate these false brethren, any more than betray them; for they are taught to love all men, even their enemies; but these apostates should hate them, in whose communion they before were, and to whom they belonged; and even to a very great degree of hatred, as it often is seen, that such who turn their backs on Christ, and his Gospel, prove the most bitter enemies, and most violent persecutors of its preachers and followers.

Then shall many be offended. Shall stumble and fall, rather than suffer for Christ. The half-hearted always do.

Then shall many he offended - So as utterly to make shipwreck of faith and a pure conscience. But hold ye fast faith, Matthew 24:11. in spite of false prophets: love, even when iniquity and offences abound, Matthew 24:12. And hope, unto the end, Matthew 24:13. He that does so, shall be snatched out of the burning. The love of many will wax cold - The generality of those who love God will (like the Church at Ephesus, Revelation 2:4,) leave their first love.