Divine providence and wisdom (qadr)

وَجَآءَ إِخْوَةُ يُوسُفَ فَدَخَلُوا۟ عَلَيْهِ فَعَرَفَهُمْ وَهُمْ لَهُۥ مُنكِرُونَ

And the brothers of Joseph came [seeking food], and they entered upon him; and he recognized them, but he was to them unknown.