Albert Barnes Commentary 1 Kings 21:29

"Seest thou how Ahab humbleth himself before me? because he humbleth himself before me, I will not bring the evil in his days; but in his son`s days will I bring the evil upon his house." — 1 Kings 21:29 (ASV)

The evil—that is, the main evil. See 1 Kings 21:19 note; and compare 1 Kings 22:38 with the marginal reference.