I saw `Abdullah bin `Umar crossing 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."
Reference: Sahih al-Bukhari 827 In-book : Book 10, Hadith 221 USC-MSA web (English) : Vol. 1, Book 12, Hadith 790 (deprecated)
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