The Messenger of Allah ﷺ established a pact of brotherhood between Quraysh and the Ansar in his house in Medina.
حالف رسول الله ﷺ بين قريش والأنصار في داره التي بالمدينة.
Muslim narrated it in the Virtues of the Companions (2528:205) through multiple routes from Abdah bin Sulayman, from Asim, from Anas, who related it.