Surah Yusuf, Verse 15
Translation — Sahih International
So when they took him [out] and agreed to put him into the bottom of the well... But We inspired to him, "You will surely inform them [someday] about this affair of theirs while they do not perceive [your identity]."
Source
Kur'an-ı Kerim, Yûsuf Suresi 12:15
https://kuran.diyanet.gov.tr/mushaf/kuran-meal-2/12-suresi-15-ayet