It wasnarrated from Ziyad bin 'Ilaqah that he heard Mughirah say:
"TheMessenger of Allah (ﷺ) stood (in prayer) until his feet becameswollen. It was said: 'O Messenger of Allah, Allah has forgiven youyour past and future sins.' He said: 'Should I not be a thankfulslave?'" (IT)
English reference (IT): Vol. 1, Book 5, Hadith 1419 (IT)
Arabic reference (IT): Book 5, Hadith 1484 (IT)