It is narrated from Sayyiduna Abu Darda (may Allah be pleased with him), who reports from the Prophet (peace and blessings be upon him) that he said: "Shall I not tell you of an action that is superior to prayer, fasting, and charity?" The companions said: "Yes, indeed (please tell us)." He (peace and blessings be upon him) said: "Reconciling between people who are at odds. And creating discord among people shaves (destroys) the religion."
Hadith Referenceالادب المفرد / كتاب / 391
Hadith Gradingالألبانی:صحيح
Hadith Takhrij«صحيح : أخرجه أبوداؤد ، كتاب الأدب ، باب فى إصلاح ذات البين : 4919 و الترمذي : 2509 - انظر المشكاة : 5038»
It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both), regarding the statement of Allah Almighty: «﴿فَاتَّقُوااللَّهَوَأَصْلِحُواذَاتَبَيْنِكُمْ﴾»[الأنفال: 1] "Fear Allah and make peace among yourselves," he said: In this, Allah Almighty has made it obligatory upon the believers that they must fear Allah in all circumstances and make peace in their mutual affairs.
Hadith Referenceالادب المفرد / كتاب / 392
Hadith Gradingالألبانی:صحيح الإسناد موقوفًا و روى نحوه مرفوعًا من حديث ابن عباس
Hadith Takhrij«صحيح الإسناد موقوفًا و روى نحوه مرفوعًا من حديث ابن عباس : أخرجه ابن أبى شيبة : 34780 و الطبراني فى تفسيره : 384/13 و البيهقي فى شعب الإيمان : 11084 - التعليق الرغيب : 410/3»