To put the hands (palms) on both knees while bowing.
باب وَضْعِ الأَكُفِّ عَلَى الرُّكَبِ فِي الرُّكُوعِ
1655
Sahih Bukhari
Sahih
حَدَّثَنَا عَبْدُ اللَّهِ بْنُ مَسْلَمَةَ، حَدَّثَنَا يَزِيدُ بْنُ زُرَيْعٍ، عَنْ يُونُسَ، عَنِ زِيَادِ بْنِ جُبَيْرٍ، قَالَ رَأَيْتُ ابْنَ عُمَرَ ـ رضى الله عنهما ـ أَتَى عَلَى رَجُلٍ، قَدْ أَنَاخَ بَدَنَتَهُ يَنْحَرُهَا، قَالَ ابْعَثْهَا قِيَامًا مُقَيَّدَةً، سُنَّةَ مُحَمَّدٍ صلى الله عليه وسلم. وَقَالَ شُعْبَةُ عَنْ يُونُسَ أَخْبَرَنِي زِيَادٌ.
Narrated Ziyad bin Jubair:
I saw Ibn `Umar passing by a man who had made his Badana sit to slaughter it. Ibn `Umar said, "Slaughter it while it is standing with one leg tied up as is the tradition of Muhammad."
Reference: Sahih al-Bukhari 1713 In-book : Book 25, Hadith 191 USC-MSA web (English) : Vol. 2, Book 26, Hadith 771 (deprecated)
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