Prayers (Salat)
8/88. Chapter:
To clasp one's hands by interlocking the fingers in the mosque or outside the mosque
Sahih Bukhari
حَدَّثَنَا حَامِدُ بْنُ عُمَرَ، عَنْ بِشْرٍ، حَدَّثَنَا عَاصِمٌ، حَدَّثَنَا وَاقِدٌ، عَنْ أَبِيهِ، عَنِ ابْنِ عُمَرَ، أَوِ ابْنِ عَمْرٍو شَبَّكَ النَّبِيُّ صلى الله عليه وسلم أَصَابِعَهُ.
Narrated Ibn `Umar or Ibn `Amr: The Prophet (ﷺ) clasped his hands, by interlacing his fingers.
Reference : Sahih al-Bukhari 478, 479In-book reference : Book 8, Hadith 126USC-MSA web (English) reference : Vol. 1, Book 8, Hadith 467