Revelation 2:21

Fornication - Sexual immorality.

I gave her space to repent - "This alludes to the history of Jezebel. God first sent Elijah to Ahab to pronounce a severe judgment upon him; upon which Ahab showed tokens of repentance, and so God put off his punishment. By these means the like punishment pronounced against Jezebel was also put off. Thus God gave her time to repent, which she did not, but instead of that seduced her sons to the same sins. See 1 Kings 21:1-29. According to the Mosaical law, the punishment of idolatrous seducers was not to be delayed at all, but God sometimes showed mercy; and now much more under the Christian dispensation, though that mercy is often abused, and thus produces the contrary effect, as in the case of this Jezebel. See Ecclesiastes 8:11.

And I gave her space to repent of her fornication - Probably after some direct and solemn warning of the evil of her course. The error and sin had been of long standing, but he now resolved to bear with it no longer. It is true of almost every great sinner, that sufficient time is given for repentance, and that vengeance is delayed after crime is committed. But it cannot always be deferred, for the period must arrive when no reason shall exist for longer delay, and when punishment must come upon the offender.

And she repented not - As she did not do it; as she showed no disposition to abandon her course; as all plea of having had no time to repent would now be taken away, it was proper that he should rise in his anger and cut her down.

2:21 And I gave her time to repent - So great is the power of Christ! But she will not repent - So, though repentance is the gift of God, man may refuse it; God will not compel.