It is narrated from Sayyiduna Salamah bin al-Akwa' (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "The tribe of Aslam, Allah has granted it safety, and the tribe of Ghifar, Allah has forgiven it. It is not I who said this; rather, Allah said it."
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 6228