One may not combine in marriage a woman and her paternal aunt, or a woman and her maternal aunt The Messenger of Allah (may Allah's peace and blessings be upon him) said concerning the daughter of Hamzah: She is not lawful for me (to marry). That which is unlawful due to lineage (blood relation) is unlawful due to breastfeeding. She is the daughter of my foster-brother. Even if she was not my stepdaughter whom I raised, she would still be unlawful for me because she is my niece through suckling. Thuwaybah breastfed me and Abu Salāmah (her father). So, do not offer me your daughters or sisters We received a letter from ‘Umar ibn al-Khattāb one year before his death. He said: Cancel every marriage between unmarriageable relatives from among the Magians