Quran 18:59 — The Cave (Al-Kahf)

Many a community we annihilated because of their transgressions, we designated a specific time for their annihilation.

[18:58] Yet, your Lord is the Forgiver, full of mercy. If He called them to account for their deeds, He would annihilate them right there and then. Instead, He gives them a respite until a specific, predetermined time; then they can never escape.

[18:60] Moses said to his servant, "I will not rest until I reach the point where the two rivers meet, no matter how long it takes."