Musnad Ahmad 1714

Khalid bin Salamah said: " ‘Abdul-Hameed bin ‘AbdurRahman invited Moosa bin Talhah when his son got married. He said: O Abu Moosa, what have you heard about sending blessings upon the Prophet (ﷺ) ? Moosa said: I asked Zaid bin Kharijah about sending blessings upon the Prophet (ﷺ) and Zaid said: I asked the Messenger of Allah (ﷺ) about that myself. I said: How should one send blessings upon you? He said: “Send blessings upon me and try your best, then say: O Allah, bless Muhammad and the family of Muhammad as You blessed the family of Ibraheem, verily You are Most Praiseworthy, Most Glorious."