﴿ وَقَالَ ٱلَّذِى ٱشْتَرَىٰهُ مِن مِّصْرَ لِٱمْرَأَتِهِۦٓ أَكْرِمِى مَثْوَىٰهُ عَسَىٰٓ أَن يَنفَعَنَآ أَوْ نَتَّخِذَهُۥ وَلَدًۭا ۚ وَكَذَٰلِكَ مَكَّنَّا لِيُوسُفَ فِى ٱلْأَرْضِ وَلِنُعَلِّمَهُۥ مِن تَأْوِيلِ ٱلْأَحَادِيثِ ۚ وَٱللَّهُ غَالِبٌ عَلَىٰٓ أَمْرِهِۦ وَلَٰكِنَّ أَكْثَرَ ٱلنَّاسِ لَا يَعْلَمُونَ ﴾

“And the man from Egypt who bought him said to his wife: "Make his stay [with us] honourable; he may well be of use to us, or we may adopt him as a son. And thus We gave unto Joseph a firm place on earth; and [We did this] so that We might impart unto him some understanding of the inner meaning of happenings. For, God always prevails in whatever be His purpose: but most people know it not.”

Please check ayah 12:22 for complete tafsir.