Muwatta Malik 1238
موطأ مالك#1238SahihYahya related to me from Malik that Abdullah ibn Dinar said, "I heard Abdullah ibn Umar recite from the Qur'an, 'Prophet! When you divorce women, divorce them at the beginning of their idda.'" Malik said, "He meant by that, to make one pronouncement of divorce at the beginning of each period of purity
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Salim al-HilaliMauquf Sahih
In-book reference: 29:35