Sahih Muslim
Sahih Muslim 571 b
As-Sahw (forgetfulness) in prayer and prostrating to compensate for it
Arabic hadith text
حَدَّثَنِي أَحْمَدُ بْنُ عَبْدِ الرَّحْمَنِ بْنِ وَهْبٍ، حَدَّثَنِي عَمِّي عَبْدُ اللَّهِ، حَدَّثَنِي دَاوُدُ بْنُ قَيْسٍ، عَنْ زَيْدِ بْنِ أَسْلَمَ، بِهَذَا الإِسْنَادِ وَفِي مَعْنَاهُ قَالَ " يَسْجُدُ سَجْدَتَيْنِ قَبْلَ السَّلاَمِ " . كَمَا قَالَ سُلَيْمَانُ بْنُ بِلاَلٍ
Translation
This hadith has been narrated by Zaid b. Aslam with the same chain of transmitters and he said
He should perform two prostrations before the salutation, as it was mentioned by Sulaiman b. Bilal.