It wasnarrated that 'Aishah said:
"When the Messenger of Allah (ﷺ)said the Salam, he would sit only for as long as it took to say:'Allahumma Antas-Salam wa minkas-salam. Tabarakta ya Dhal-jalaliwal-ikram. (O Allah, You are As-Salam, From You is all peace, blessedareYou O Possessor of majesty and honour).'" (TR)
English reference (TR): Vol. 1, Book 5, Hadith 924 (TR)
Arabic reference (TR): Book 5, Hadith 977 (TR)