Sahih Muslim Book 31, Hadith Number 6112.

Chapter : Allah’s Apostle (may peace be upon him) invoked blessings upon the tribes of Ghifar and Aslam.

Abu Dharr reported Allah’s Messenger (may peace be upon him) as saying: Go to your people and say that the Messenger of Allah (may peace be upon him) says: Ghifar (is a tribe) to whom Allah granted pardon, and Aslam (is the tribe) to whom Allah granted safety.