that the Prophet ﷺ entered upon her while a man was sitting with her. Signs of answer seemed to appear on his face as if he disliked that. She said, "Here is my (foster) brother." He said, "Be sure as to who is your foster brother, for foster suckling relationship is established only when milk is the only food of the child." (Using translation from Bukhārī 5102)
أَنَّ رَسُولَ اللَّهِ ﷺ دَخَلَ عَلَيْهَا وَعِنْدَهَا رَجُلٌ فَتَغَيَّرَ وَجْهُهُ وَكَأَنَّهُ كَرِهَ ذَلِكَ فَقُلْتُ إِنَّهُ أَخِي مِنَ الرَّضَاعَةِ فَقَالَ «انْظُرْنَ مَا إِخْوَانُكُنَّ فَإِنَّمَا الرَّضَاعَةُ مِنَ الْمَجَاعَةِ»