Silsilah as-Sahihah 706 — Supplications after prayer

Sayyidah Aisha (may Allah be pleased with her) narrates: When the Messenger (peace and blessings of Allah be upon him) would finish the prayer with salam, he would remain seated only for as long as it takes to recite this supplication: «اللهم انت السلام ومنك السلام تباركت ذا الجلال والإكرام» O Allah! You are the Source of peace and from You is all peace. O Possessor of majesty and honor! You are blessed.