Quran 40:84 — Forgiver (Ghafer)

Subsequently, when they saw our retribution they said, "Now we believe in GOD ALONE, and we now disbelieve in the idol worship that we used to practice."

[40:83] When their messengers went to them with clear proofs, they rejoiced in the knowledge they had inherited, and the very things they ridiculed were the cause of their fall.

[40:85] Their belief then could not help them in the least, once they saw our retribution. Such is GOD's system that has been established to deal with His creatures; the disbelievers are always doomed.