Sahih Muslim
The Book Pertaining to the Merits of the Companions (Allah Be Pleased With Them) of the Holy Prophet (May Peace Be Upon Him) (Kitab Al-Fadail Al-Sahabah)
Book Number: 031 / Hadith Number: 6112
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.