Sahih Al Bukhari Hadith Number 2294

Narrated `Asim: I heard Anas bin Malik, “Have you ever heard that the Prophet (peace be upon him) said, ‘There is no alliance in Islam?’ ” He replied, “The Prophet (peace be upon him) made alliance between Quraish and the Ansar in my house.”

39  Kafalah
Hadith number 2294
Volume no 3
Chapter: 2 (The Statement of Allah jala jalaaluhu:”… To those also with whom you have made a pledge, give them their due portion by Wasiya…”)