Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) narrates: The Prophet (peace and blessings be upon him) would keep praying (voluntary prayer) at night until his feet became swollen. It was said: "O Messenger of Allah! Allah Almighty has forgiven your past and future sins." The Prophet (peace and blessings be upon him) said: Should I not be a grateful servant?
Al-Tabarani recorded it in al-Mu'jam al-Saghir and al-Mu'jam al-Awsat; its chain contains Abd al-Rahman bin Uthman, and he is weak, though Ibn Hibban declared him thiqah (trustworthy).
Hadith Takhrij«المعجم الصغير للطبراني من اسمه جعفر 328 المعجم الأوسط للطبراني، باب الجيم من اسمه جعفر، 3455 ، أخرجه المعجم الأوسط للطبراني برقم: 3398، وأخرجه المعجم الصغير للطبراني برقم: 301»