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Narrated Al-Mughira:

The Prophet 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."
حَدَّثَنَا أَبُو نُعَيْمٍ، قَالَ حَدَّثَنَا مِسْعَرٌ، عَنْ زِيَادٍ، قَالَ سَمِعْتُ الْمُغِيرَةَ ـ رضى الله عنه ـ يَقُولُ إِنْ كَانَ النَّبِيُّ صلى الله عليه وسلم لَيَقُومُ لِيُصَلِّيَ حَتَّى تَرِمُ قَدَمَاهُ أَوْ سَاقَاهُ، فَيُقَالُ لَهُ فَيَقُولُ ‏
"‏ أَفَلاَ أَكُونُ عَبْدًا شَكُورًا ‏"‏‏.‏

Classification

Sahih (Authentic)

References

• Sahih al-Bukhari, 1130
• Sahih al-Bukhari, Vol. 2, Book of Night Prayer (Tahajjud), Hadith 230
• Sahih al-Bukhari, Book of Night Prayer (Tahajjud), Hadith 230