Joseph
فَلَمَّا ذَهَبُوا۟ بِهِۦ وَأَجْمَعُوٓا۟ أَن يَجْعَلُوهُ فِى غَيَـٰبَتِ ٱلْجُبِّ ۚ وَأَوْحَيْنَآ إِلَيْهِ لَتُنَبِّئَنَّهُم بِأَمْرِهِمْ هَـٰذَا وَهُمْ لَا يَشْعُرُونَ
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]."
Nearby ayahs help place verse 12:15 in sequence and meaning.
قَالَ إِنِّى لَيَحْزُنُنِىٓ أَن تَذْهَبُوا۟ بِهِۦ وَأَخَافُ أَن يَأْكُلَهُ ٱلذِّئْبُ وَأَنتُمْ عَنْهُ غَـٰفِلُونَ
[Jacob] said, "Indeed, it saddens me that you should take him, and I fear that a wolf would eat him while you are of him unaware."
قَالُوا۟ لَئِنْ أَكَلَهُ ٱلذِّئْبُ وَنَحْنُ عُصْبَةٌ إِنَّآ إِذًا لَّخَـٰسِرُونَ
They said, "If a wolf should eat him while we are a [strong] clan, indeed, we would then be losers."
وَجَآءُوٓ أَبَاهُمْ عِشَآءً يَبْكُونَ
And they came to their father at night, weeping.
قَالُوا۟ يَـٰٓأَبَانَآ إِنَّا ذَهَبْنَا نَسْتَبِقُ وَتَرَكْنَا يُوسُفَ عِندَ مَتَـٰعِنَا فَأَكَلَهُ ٱلذِّئْبُ ۖ وَمَآ أَنتَ بِمُؤْمِنٍ لَّنَا وَلَوْ كُنَّا صَـٰدِقِينَ
They said, "O our father, indeed we went racing each other and left Joseph with our possessions, and a wolf ate him. But you would not believe us, even if we were truthful."