We asked, "Messenger of Allah, how should we send blessings upon you?"He replied, "Say, 'O Allah, send blessings upon Muhammad and the family of Muhammad, as You sent blessings upon Ibrahim and the family of Ibrahim. Indeed, You are Praiseworthy, Glorious. And bless Muhammad and the family of Muhammad, as You blessed Ibrahim and the family of Ibrahim. Indeed, You are Praiseworthy, Glorious.'"
قلنا يا رسول الله: كيف الصلاة عليك؟ قال: قولوا: اللهم صل على محمد وعلى آل محمد، كما صليت على إبراهيم وآل إبراهيم إنك حميد مجيد، وبارك على محمد وعلى آل محمد كما باركت على إبراهيم وآل إبراهيم إنك حميد مجيد.
Nasai (1290) narrated it from Ishaq bin Ibrahim, who said, Muhammad bin Bishr informed us, who said, Mujammi bin Yahya narrated to us, from Uthman bin Mawhab, from Musa bin Talha, from his father, and he mentioned it.Its isnad is hasan because of Mujammi bin Yahya, for he is trustworthy (saduq). This is why Hafiz graded its isnad hasan in Talkhis (1/268).