Hadith 219
Lady Aisha (may Allah be pleased with her) says: When the Messenger of Allah (peace and blessings be upon him) would finish the prayer with salam, he would remain seated in the same manner until he said: "Allahumma anta as-salam wa minka as-salam tabarakta ya dhal-jalali wal-ikram," meaning, "O Allah! You are Peace, and from You is all peace, blessed are You, O Possessor of Majesty and Honor."