Sahih Muslim Book - 4, Hadith - 908

حَدَّثَنَا مُحَمَّدُ بْنُ الْمُثَنَّى وَمُحَمَّدُ بْنُ بَشَّارٍ وَاللَّفْظُ لِابْنِ الْمُثَنَّى قَالَا حَدَّثَنَا مُحَمَّدُ بْنُ جَعْفَرٍ حَدَّثَنَا شُعْبَةُ عَنْ الْحَكَمِ قَالَ سَمِعْتُ ابْنَ أَبِي لَيْلَى قَالَ لَقِيَنِي كَعْبُ بْنُ عُجْرَةَ فَقَالَ أَلَا أُهْدِي لَكَ هَدِيَّةً خَرَجَ عَلَيْنَا رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فَقُلْنَا قَدْ عَرَفْنَا كَيْفَ نُسَلِّمُ عَلَيْكَ فَكَيْفَ نُصَلِّي عَلَيْكَ قَالَ قُولُوا اللَّهُمَّ صَلِّ عَلَى مُحَمَّدٍ وَعَلَى آلِ مُحَمَّدٍ كَمَا صَلَّيْتَ عَلَى آلِ إِبْرَاهِيمَ إِنَّكَ حَمِيدٌ مَجِيدٌ اللَّهُمَّ بَارِكْ عَلَى مُحَمَّدٍ وَعَلَى آلِ مُحَمَّدٍ كَمَا بَارَكْتَ عَلَى آلِ إِبْرَاهِيمَ إِنَّكَ حَمِيدٌ مَجِيدٌ.

Ibn Abi Laila said: "Ka'b bin 'Ujrah met me and said: 'Shall I not give you a gift? The Messenger of Allah (s.a.w) came out to us and we said: "We know what it means to send Salam upon you, but what does it mean to send Salat upon you?" He said: "Say: 'Allahumma salli 'ala Muhammadin wa 'ala ali Muhammadin kama sallaita 'ala ali Ibrahim, innaka hamidun majid; Allahumma barik 'ala Muhammadin wa 'ala ali Muhammadin kama barakta 'ala ali Ibrah'im, innaka hamidun majid (O Allah, send Your Salat (grace, honor and mercy) upon Muhammad and upon the family of Muhammad, as You sent Your Salat upon the family of Ibrahim, You are indeed Praiseworthy, Most Glorious. O Allah, send Your blessings upon Muhammad and the family of Muhammad, as You sent Your blessings upon the family of Ibrahim, You are indeed Praiseworthy, Most Glorious)."'