اللَّهُـمَّ صَلِّ عَلَـى مُحَمَّـدٍ وَعَلَـى آلِ مُحَمَّـدٍ ، كَمَـا صَلَّيْـتَ عَلَـى إِبْرَاهِـيمَ وَعَلَى آلِ إِبْرَاهِـيمَ، إِنَّكَ حَـمِيدٌ مَـجِيدٌ. اللَّهُمَّ بَارِكْ عَلَى مُحَمَّدٍ وَعَلَى آلِ مُحَمَّدٍ، كَمَا بَارَكْتَ عَلَى إِبْرَاهِيمَ وَعَلَى آلِ إِبْرَاهِيمَ، إِنَّكَ حَـمِيدٌ مَـجِيدٌ
Allāhumma ṣalli ‘alā muḥammad, wa ‘alā āli muḥammad, kamā ṣallayta ‘alā ibrāhīma wa ‘alā āli ibrāhīm, innaka ḥamīdun majīd, allāhumma bārik ‘alā muḥammad, wa ‘alā āli muḥammad, kamā bārakta ‘alā ibrāhīma wa ‘alā āli ibrāhīm, innaka ḥamīdun majīd.
Translation
O Allah, send prayers* upon Mohammed and the followers** of Mohammed, just as You sent prayers upon Ibrahim and upon the followers of Ibrahim. Verily, You are full of praise and majesty. O Allah, send blessings upon Mohammad and upon the family of Mohammed, just as You sent blessings upon Ibraheem and upon the family of Ibraheem. Verily, You are full of praise and majesty.
When to recite
After the tashahhud, sending blessings upon the Prophet.
Source / Reference
Hisnul Muslim 53