Ibrahim Nakha'i (may Allah have mercy on him) said: "If a man marries a woman who is his mahram and consummates the marriage, the woman will receive the dowry; if he does not consummate, she will not receive the dowry, and separation will be enforced between them." And Hammad (may Allah have mercy on him) said: "Whatever the woman has taken is hers."
Hadith Referenceسنن سعید بن منصور / كتاب النكاح / 2015
Hadith Takhrij«أخرجه سعيد بن منصور فى «سننه» ترقيم الدرالسلفية برقم:، 838، 839، وابن أبى شيبة فى «مصنفه» برقم: 17617، 17619، 17621»