عَنْ عَائِشَةَ رَضِيَ اللَّهُ عَنْهَا قَالَتْ قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ يَحْرُمُ مِنَ الرَّضَاعِ مَا يَحْرُمُ مِنَ النَّسَبِ مِنْ خَالٍ أَوْ عَمٍّ أَوِ ابْنِ أَخٍ
Narrated by Sayyida Aisha (may Allah be pleased with her) that the Noble Prophet (peace and blessings be upon him) said: The relationship that becomes unlawful due to suckling (breastfeeding) is the same as that which becomes unlawful due to lineage, such as maternal uncle, paternal uncle, nephew, etc.