Musnad Ahmad 574:2

Abu al-Nadr narrated to us, Shu'bah narrated to us, from 'Amr ibn Murrah, he said: I heard 'Amr ibn Maymun narrating from 'Abdullah ibn Rabi'ah al-Sulami, from 'Ubayd ibn Khalid, and he was one of the companions of the Prophet, may Allah bless him and grant him peace, he said: The Prophet, may Allah bless him and grant him peace, established brotherhood between two men, and he mentioned the hadith.