Muwatta Imam Malik Book of Shortening the Prayer, Hadith 69

Yahya related to me from Malik from Abdullah ibn Abi Bakr ibn Hazim from his father that Amr ibn Sulaym az-Zuraqi said, "Abu Humayd as-Saidi told me that they asked the Messenger of Allah ﷺ how they were to ask for blessings upon him and he replied that they should say, 'O Allah, bless Muhammad and his wives and his descendants asYou blessed the family of Ibrahim, and give baraka to Muhammad and his wives and his descendants as You gave baraka to the family of Ibrahim. You are worthy of Praise and Glorious.'"
Allahumma salli ala Muhammad wa azwajihi wa alihi kama sallaita ala ali Ibrahim, wa barakaala Muhammad wa azwajihi wa alihi kama baraktaalaali Ibrahim, innaka Hamidu'm - Majid.

حَدَّثَنِي يَحْيَى، عَنْ مَالِكٍ، عَنْ عَبْدِ اللَّهِ بْنِ أَبِي بَكْرِ بْنِ حَزْمٍ، عَنْ أَبِيهِ، عَنْ عَمْرِو بْنِ سُلَيْمٍ الزُّرَقِيِّ، أَنَّهُ قَالَ أَخْبَرَنِي أَبُو حُمَيْدٍ السَّاعِدِيُّ، أَنَّهُمْ قَالُوا يَا رَسُولَ اللَّهِ كَيْفَ نُصَلِّي عَلَيْكَ فَقَالَ " قُولُوا اللَّهُمَّ صَلِّ عَلَى مُحَمَّدٍ وَأَزْوَاجِهِ وَذُرِّيَّتِهِ كَمَا صَلَّيْتَ عَلَى آلِ إِبْرَاهِيمَ وَبَارِكْ عَلَى مُحَمَّدٍ وَأَزْوَاجِهِ وَذُرِّيَّتِهِ كَمَا بَارَكْتَ عَلَى آلِ إِبْرَاهِيمَ إِنَّكَ حَمِيدٌ مَجِيدٌ " .