"Aishah said: 'The Messenger of Allah entered upon me and there was a man sitting with me. He got upset about that, and I saw the anger in his face.' I said: "O Messenger of Allah, he is my brother through breast-feeding." He said: "Be careful who you count as your brothers" --or: "be careful who you count as your brothers through breast-feeding"-- "for the breast-feeding (which makes marriage prohibited) is from hunger." (Using translation from Nasāʾī 3312)
عَائِشَةُ دَخَلَ عَلَيَّ رَسُولُ اللهِ ﷺ وَعِنْدِي رَجُلٌ قَاعِدٌ فَاشْتَدَّ ذَلِكَ عَلَيْهِ وَرَأَيْتُ الْغَضَبَ فِي وَجْهِهِ فَقُلْتُ يَا رَسُولَ اللهِ إِنَّهُ أَخِي مِنَ الرَّضَاعَةِ فَقَالَ رَسُولُ اللهِ ﷺ انْظُرْنَ إِخْوَتَكُنَّ وَقَالَ مَرَّةً أُخْرَى انْظُرْنَ مَنْ إِخْوَتَكُنَّ مَنْ الرَّضَاعَةِ فَإِنَّمَا الرَّضَاعَةُ مِنَ الْمَجَاعَةِ