Al-Kahf (The Cave)
Surah 18 · Verse 55
And nothing holds back mankind from believing when the guidance comes to them, and from asking protective forgiveness from their Fosterer, except that (they wait) that the procedure (adopted) for the ancients should be adopted for them (too), or (that) the punishment should come face to face (with them).
Many people believe and ask for forgiveness only after seeing the punishment
