Muwatta Malik 1231
موطأ مالك#1231Da'ifYahya 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
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Salim al-HilaliDaif
In-book reference: 29:28