Muwatta Malik 1639
موطأ مالك#1639SahihThese are the words of a Successor — the generation after the Companions — not of the Prophet ﷺ.
وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ يَحْيَى بْنِ سَعِيدٍ، أَنَّهُ قَالَ سَمِعْتُ سَعِيدَ بْنَ الْمُسَيَّبِ، يَقُولُ أَلاَ أُخْبِرُكُمْ بِخَيْرٍ، مِنْ كَثِيرٍ مِنَ الصَّلاَةِ وَالصَّدَقَةِ قَالُوا بَلَى . قَالَ إِصْلاَحُ ذَاتِ الْبَيْنِ وَإِيَّاكُمْ وَالْبِغْضَةَ فَإِنَّهَا هِيَ الْحَالِقَةُ .
Yahya related to me from Malik that Yahya ibn Said said that he heard Said ibn al-Musayyab say, "Shall I tell you what is better than much prayer and sadaqa?" They said, "Yes." He said, "Mending discord. And beware of hatred - it strips you (of your deen)
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: 47:7