Maliks Muwatta Book 29, Hadith Number 73.

Yahya related to me from Malik that he had heard that Umar ibn al-Khattab, Abdullah ibn Umar, Abdullah ibn Masud, Salim ibn Abdullah, al-Qasim ibn Muhammad, Ibn Shihab, and Sulayman ibn Yasar all said, “If a man has vowed to divorce his wife before marrying her and then he breaks his vow, divorce is obligatory for him when he marries her.”

Yahya related to me from Malik that he had heard that Abdullah ibn Masud said that there was nothing binding on someone who said, “Every woman I marry is divorced,” if he did not name a specific tribe or woman.

Malik said, “That is the best of what I have heard.”

Malik said about a man saying to his wife, “You are divorced, and every woman I marry is divorced,” or that all his property would be sadaqa if he did not do such-and-such, and he broke his oath| “As for his wives, it is divorce as he said, and as for his statement, ‘Every woman I marry is divorced’, if he did not name a specific woman, tribe, or land, or such, it is not binding on him and he can marry as he wishes. As for his property, he gives a third of it away as sadaqa.”