Years and years passed, Adam grew old and his children spread all over the earth. Muhammad Ibn Ishaq related that when Adam's death drew near, he appointed his son Seth to be his successor and taught him the hours of the day and night along with their appropriate acts of worship. He also foretold to him the floor that would come.
Abu Dhar narrated that the Prophet Muhammad (PBUH) said: "Allah sent down 104 psalms, of which 50 were sent down to Seth."