Sahih Muslim Book 032, Hadith Number 6262.
Hadith Section/Book: Sahih Muslim Sahih Muslim Book 32. Virtues, Good Manners and Joining Of The Ties Of Relationship
Chapter : There should be mutual fellow-feeling and love and the will to help each other amongst the believers.
A hadith like this has been narrated on the authority of Nu'man b. Bashir through another chain of transmitters.