Reference : Hisn al-Muslim 54

اللّهُـمَّ صَلِّ عَلـى مُحمَّـدٍ 
وَعَلـى أَزْواجِـهِ وَذُرِّيَّـتِه، 
كَمـا صَلَّيْـتَ عَلـى آلِ إبْراهـيم .
وَبارِكْ عَلـى مُحمَّـدٍ 
وَعَلـى أَزْواجِـهِ وَذُرِّيَّـتِه،
كَمـا بارِكْتَ عَلـى آلِ إبْراهـيم . 
إِنَّكَ حَمـيدٌ مَجـيد
Allāhumma ṣalli `alā Muḥammadin
wa `alā 'azwājihi wa dhurriyyatihi,
kamā ṣallayta `alā 'āli 'Ibrāhīma. 
Wa bārik `alā Muḥammadin
wa `alā 'azwājihi wa dhurriyyatihi, 
kamā bārakta `alā 'āli 'Ibrāhīma.
'Innaka ḥamīdum-majīd.


O Allah, bestow Your favor on Muhammad and upon his wives and progeny as You have bestowed Your favor upon the family of Ibrahim. 
And bless Muhammad and his wives and progeny as You have blessed the family of Ibrahim, You are full of praise, Most Glorious.

Reference:
Al-Bukhari, from Al-Asqalani, Fathul-Bari 6/ 407, Muslim 1/306.

Chapter: Prayers upon the Prophet ﷺ after the tashahhud