حَدَّثَنَا سُلَيْمَانُ بْنُ دَاوُدَ حَدَّثَنَا زُهَيْرٌ حَدَّثَنَا أَبُو إِسْحَاقَ عَنْ عَبْدِ الرَّحْمَنِ بْنِ الْأَسْوَدِ عَنْ عَلْقَمَةَ وَالْأَسْوَدِ عَنْ عَبْدِ اللَّهِ قَالَ أَنَا رَأَيْتُ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يُكَبِّرُ فِي كُلِّ رَفْعٍ وَوَضْعٍ وَقِيَامٍ وَقُعُودٍ وَيُسَلِّمُ عَنْ يَمِينِهِ وَعَنْ يَسَارِهِ السَّلَامُ عَلَيْكُمْ وَرَحْمَةُ اللَّهِ السَّلَامُ عَلَيْكُمْ وَرَحْمَةُ اللَّهِ حَتَّى يَبْدُوَ جَانِبُ خَدِّهِ وَرَأَيْتُ أَبَا بَكْرٍ وَعُمَرَ يَفْعَلَانِ ذَلِكَ
مسند امام احمد بن حنبل · Hadith 4055
It was narrated that 'Abdullah (RA) said: I saw the Messenger of Allah (PBUH) saying takbecr every time he raised and lowered his head (in prayer), and every time he moved to stand or sit, and saying the sal am to his right and to his left, as-salamu 'alaikum wa rahmatullah , as-salamu 'alaikum wa rahmatullah , until the side of his cheek appeared, and I saw Abu Bakr and 'Umar doing likewise.
Sanad
حَدَّثَنَا سُلَيْمَانُ بْنُ دَاوُدَ حَدَّثَنَا زُهَيْرٌ حَدَّثَنَا أَبُو إِسْحَاقَ عَنْ عَبْدِ الرَّحْمَنِ بْنِ الْأَسْوَدِ عَنْ عَلْقَمَةَ وَالْأَسْوَدِ عَنْ عَبْدِ اللَّهِ