Muwatta Malik 1217
موطأ مالك#1217SahihThese are the words of a Successor — the generation after the Companions — not of the Prophet ﷺ.
وَحَدَّثَنِي عَنْ مَالِكٍ، عَنِ الْفُضَيْلِ بْنِ أَبِي عَبْدِ اللَّهِ، مَوْلَى الْمَهْرِيِّ أَنَّ الْقَاسِمَ بْنَ مُحَمَّدٍ، وَسَالِمَ بْنَ عَبْدِ اللَّهِ، كَانَا يَقُولاَنِ إِذَا طُلِّقَتِ الْمَرْأَةُ فَدَخَلَتْ فِي الدَّمِ مِنَ الْحَيْضَةِ الثَّالِثَةِ فَقَدْ بَانَتْ مِنْهُ وَحَلَّتْ .
Yahya related to me from Malik from al-Fudayl ibn Abi Abdullah, the mawla of al-Mahri that al-Qasim ibn Muhammad and Salim ibn Abdullah said, "When a woman is divorced and begins her third period, she is clearly separated from him and is free to marry again
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
In-book reference: 29:14