Sahih Al Bukhari – Book of Characteristics Of Prayer
Volume 001, Book 012, Hadith Number 790.
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Narated By ‘Abdullah bin ‘Abdullah Razi Allah Anhu: I saw ‘Abdullah bin ‘Umar
Razi Allah Anhucrossing his legs while sitting in the prayer and I, a mere youngster in those days, did the same. Ibn ‘Umar forbade me to do so, and said, “The proper way is to keep the right foot propped up and bend the left in the prayer.” I said questioningly, “But you are doing so (crossing the legs).” He said, “My feet cannot bear my weight.”
Bukhari Characteristics of Prayer :: [1.12.790] (quranexplorer.com)
SAHIH BUKHARI, BOOK 12: Characteristics of Prayer (iium.edu.my)
Junaid Tahir