Anas reported Allah's Messenger (ﷺ) established fraternity between the Quraish and the Ansar in his house at Medina.
Sahih Muslim Book 44, Hadith 293
← Previous Hadith You must have heard this that Allah's Messenger (ﷺ) said: There is no alliance (hilf) of brotherhood in Islam. Anas said: Allah's Messenger (ﷺ) established the bond of fraternity between the Quraish and the Ansar in his home.

Sahih Muslim Book 44, Hadith 292 Next Hadith → There is no alliance (hilf) in Islam but (the hilf) established in the pre-Islamic days (for good). Islam intensifies and strengthens it.

Sahih Muslim Book 44, Hadith 294