The Prophet (ﷺ) used to stand (in the prayer) or pray till both his feet or legs swelled. He was asked why (he offered such an unbearable prayer) and he said, “”should I not be a thankful slave.
Sahih al-Bukhari 1130
The Prophet’s Mosque and its Musalla
“Narrated Sahl (bin Sa`d): The distance between the Musalla of