Bulugh al-Maram #383

Narrated Abu Mas'ud Al-Ansari (RA): Bashir bin Sa'd said, "Allah has commanded us to invoke blessings on you, O Messenger of Allah! But how should we bless you?" Allah's Messenger (ﷺ) kept quiet (a while) and then said, "Say: 'O Allah, bless Muhammad and the members of his family as You have blessed Ibrahim, and grant favours to Muhammad and the members of his family as You have granted favours to Ibrahim. In the worlds You are indeed Praiseworthy and Glorious.' And the Taslim is as you know. .