2. Ṣalāh (Ritual Prayer)
٢۔ كتاب الصلاة
"[Some of] the Companions of the Prophet complained [to the Prophet] about the hardship of the prostration on them, when they were so spread out, so he said: 'Use your knees.'"
اشْتَكَى بَعْضُ أَصْحَابِ النَّبِيِّ ﷺ إِلَى النَّبِيِّ ﷺ مَشَقَّةَ السُّجُودِ عَلَيْهِمْ إِذَا تَفَرَّجُوا فَقَالَ اسْتَعِينُوا بِالرُّكَبِ