I asked, "Messenger of Allah, how should we send blessings upon you?"He replied, "Say, 'O Allah, send Your grace upon Muhammad and the family of Muhammad, as You sent Your grace upon Ibrahim. Indeed, You are the Most Praiseworthy, the Most Glorious. And bless Muhammad and the family of Muhammad, as You blessed the family of Ibrahim. Indeed, You are the Most Praiseworthy, the Most Glorious.'"
حدثنا محمد بن بشر حدثنا مجمع بن يحيى الأنصاري حدثنا عثمان بن موهب
قلت يا رسول الله كيف الصلاة عليك قال قل اللهم صل على محمد وعلى آل محمد كما صليت على إبراهيم إنك حميد مجيد وبارك على محمد وعلى آل محمد كما باركت على آل إبراهيم إنك حميد مجيد
Its chain of transmission is sahih. Muhammad bin Bishr is Ibn Farafisa Abdi. Uthman bin Mawhab is Uthman ibn Abdullah bin Mawhab, attributed to his grandfather, and he is a trustworthy successor. The hadith was narrated by Nasai 1:190 from Ishaq bin Ibrahim from Muhammad bin Bishr, and he also narrated it after that from Ubaydullah bin Saad bin Ibrahim bin Saad from his uncle from Sharik from Uthman bin Mawhab, and Bukhari in Tarikh al-Kabir 2/1/351 from Ibn Madini from Muhammad bin Bishr, and it is also narrated by Musa bin Talha from Zayd bin Kharija, and it will come at 714.