In Islamic jurisprudence, the categories of lawful and unlawful women for marriage are clearly defined in the Quran, primarily in Surah An-Nisa, verses 22-24. These verses establish permanent prohibitions based on three fundamental relationships: consanguinity (blood-ties), affinity (marital ties), and rada (milk-fosterage). Classical scholars like Ibn Kathir and Al-Tabari have provided detailed exegesis on these verses, unanimously agreeing on the core prohibitions. These include a man's ascendants and descendants, his sisters, aunts, and nieces by blood. The prohibitions extend to certain relatives by marriage, such as his wife's mother and daughter, and his son's wife. Furthermore, the act of being breastfed by a woman establishes a 'milk kinship', creating the same marriage impediments as blood relations. All women outside of these specified prohibited categories are generally considered lawful for a Muslim man to marry, provided other conditions of a valid Islamic marriage are met.