Surah Yusuf, Verse 15

فَلَمَّا ذَهَبُواْ بِهِۦ وَأَجۡمَعُوٓاْ أَن يَجۡعَلُوهُ فِي غَيَٰبَتِ ٱلۡجُبِّۚ وَأَوۡحَيۡنَآ إِلَيۡهِ لَتُنَبِّئَنَّهُم بِأَمۡرِهِمۡ هَٰذَا وَهُمۡ لَا يَشۡعُرُونَ١٥

falammā dhahabū bihi wa-ajmaʿū an yajʿalūhu fī ghayābati l-jubi wa-awḥaynā ilayhi latunabbi-annahum bi-amrihim hādhā wahum lā yashʿurūna

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]."