Musannaf Ibn Abi Shaybah 18100 — A man who marries: what is said

Al-Hasan (may Allah have mercy on him) said: Sayyiduna Aqil bin Abi Talib (may Allah be pleased with him) married a woman of Banu Jusham and then invited people, and the people congratulated him with 'Bi al-rifa' wa al-banin'. He said: Do not say that. The people asked: Then what should we say, O Abu Yazid? He said: Say, 'Barak Allahu lakum wa baraka 'alaykum' (May Allah bless you and send His blessings upon you), for we used to say that, or we were commanded to say it.