It is narrated from Sayyiduna Abu Qirsafah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Ghifar (the tribe), Allah has forgiven it; and Aslam (the tribe), Allah has kept it safe."
Hadith Referenceالمعجم الكبير للطبراني / باب الجيم / 2504