اللَّهُمَّ صَلِّ عَلَى مُحَمَّدٍ وَعَلَى آلِ مُحَمَّدٍ كَمَا صَلَّيْتَ عَلَى إِبْرَاهِيمَ وَعَلَى آلِ إِبْرَاهِيمَ إِنَّكَ حَمِيدٌ مَجِيدٌ، اللَّهُمَّ بَارِكْ عَلَى مُحَمَّدٍ وَعَلَى آلِ مُحَمَّدٍ كَمَا بَارَكْتَ عَلَى إِبْرَاهِيمَ وَعَلَى آلِ إِبْرَاهِيمَ إِنَّكَ حَمِيدٌ مَجِيدٌ
Transliteration
Allahumma salli 'ala Muhammadin wa 'ala ali Muhammadin kama sallayta 'ala Ibrahima wa 'ala ali Ibrahima innaka hamidun majid, Allahumma barik 'ala Muhammadin wa 'ala ali Muhammadin kama barakta 'ala Ibrahima wa 'ala ali Ibrahima innaka hamidun majid
English meaning
O Allah, send prayers upon Muhammad and the family of Muhammad, as You sent prayers upon Ibrahim and the family of Ibrahim. Verily You are full of praise and majesty. O Allah, send blessings upon Muhammad and the family of Muhammad, as You sent blessings upon Ibrahim and the family of Ibrahim. Verily You are full of praise and majesty.
When is it recited?
Recited after the Tashahhud, before the final salam.
Source
Bukhari, Anbiya 10, 3370; Muslim, Salat 65, 406