Sahih Muslim 771
Sahih Muslim · Book 6: The Book of Prayer - Travellers · The prayer and the supplication of the Prophet (saws) at night
A'raj reported that when the Messenger of Allah (ﷺ) would start the prayer, he would pronounce takbir (Allah-o-Akbar) and then say:
وَحَدَّثَنَاهُ زُهَيْرُ بْنُ حَرْبٍ ، حَدَّثَنَا عَبْدُ الرَّحْمَنِ بْنُ مَهْدِيٍّ ، ح وَحَدَّثَنَا إِسْحَاقُ بْنُ، إِبْرَاهِيمَ أَخْبَرَنَا أَبُو النَّضْرِ ، قَالَ حَدَّثَنَا عَبْدُ الْعَزِيزِ بْنُ عَبْدِ اللَّهِ بْنِ أَبِي سَلَمَةَ ، عَنْ عَمِّهِ، الْمَاجِشُونِ بْنِ أَبِي سَلَمَةَ عَنِ الأَعْرَجِ ، بِهَذَا الإِسْنَادِ وَقَالَ كَانَ رَسُولُ اللَّهِ صلى الله عليه وسلم إِذَا اسْتَفْتَحَ الصَّلاَةَ كَبَّرَ ثُمَّ قَالَ " وَجَّهْتُ وَجْهِي " . وَقَالَ " وَأَنَا أَوَّلُ الْمُسْلِمِينَ " . وَقَالَ وَإِذَا رَفَعَ رَأْسَهُ مِنَ الرُّكُوعِ قَالَ " سَمِعَ اللَّهُ لِمَنْ حَمِدَهُ رَبَّنَا وَلَكَ الْحَمْدُ " . وَقَالَ " وَصَوَّرَهُ فَأَحْسَنَ صُوَرَهُ " . وَقَالَ وَإِذَا سَلَّمَ قَالَ " اللَّهُمَّ اغْفِرْ لِي مَا قَدَّمْتُ " . إِلَى آخِرِ الْحَدِيثِ وَلَمْ يَقُلْ بَيْنَ التَّشَهُّدِ وَالتَّسْلِيمِ .
I turn my face (up to Thee), I am the first of the believers; and when he raised his head from ruku' he said: Allah listened to him who praised Him; O our Lord, praise be to Thee; and he said: He shaped (man) and how fine is his shape? And he (the narrator) said: When he pronounced salutation he said: O Allah, forgive me my earlier (sins), to the end of the hadith; and he did not say it between the Tashahhud and salutation (as mentioned above).