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 heheard Said ibn al-Musayyab say, "Shall I tell you what is better thanmuch prayer and sadaqa?" They said, "Yes." He said, "Mending discord.And beware of hatred - it strips you (of your deen)." Translation Not Available

Book Ref: Muwatta Imam Malik Book 47 Hadith 1642
Web Ref:  Muwatta Imam Malik Book 47 Hadith 7