'Abdullah bin Amr (may Allah be pleased with them both) reports that the Messenger of Allah (peace and blessings of Allah be upon him) said in his sermon: "Fulfill the alliances (pacts of cooperation) of the pre-Islamic era, for they only strengthen Islam, and do not make any new pact of cooperation in Islam." __QUR_N__ Imam Tirmidhi says: 1- This hadith is Hasan Sahih, 2- In this chapter, hadiths have also been narrated from Abdur Rahman bin Awf, Umm Salamah, Jubair bin Mut'im, Abu Hurairah, Ibn Abbas, and Qais bin Asim (may Allah be pleased with them all).
Hadith Referenceسنن ترمذي / كتاب السير عن رسول الله صلى الله عليه وسلم / 1585