If before a man marries a woman he says that through breastfeeding she is unlawful for him – for example, he says he has breastfed the milk of her mother – then in the event that it is possible to substantiate his statement, he cannot marry the woman. If he says this after the conclusion of the marriage contract and the woman accepts his statement, the marriage contract is void.
Therefore, if the man has not had sexual intercourse with her, or he has but at the time of intercourse the woman knew that she was unlawful for him, she is not entitled to any dowry (mahr). However, if she realises after sexual intercourse that she was unlawful for him, then the husband must pay her a dowry that matches the dowry usually given to women like her.