This one is a theological puzzle about the nature of the Hebrew God, and a doozy to boot. The central question here is whether the God of the Hebrew Bible ever changes his mind and repents of an earlier course of action. Here are four key passages which argue that YHWH never repents. All but the last of these four verses make use of the Hebrew word נָחַם (Strong's H5162) which is the very same word used in loads of other verses to indicate divine repentence, usually accompanied by a changing in course of dealings with the covenant people.
In order to untie this Gordian knot, the apologist must maintain that נָחַם means one thing in Numbers 23:19 and 1 Samuel 15:29 and Ezekiel 24:14, but must be taken in context to mean something else entirely in all those other verses. Good luck with that.