Narrated Ibn 'Abbas: The Prophet never fasted a full month except the month of Ramadan, and he used to fast till one could say, "By Allah, he will never stop fasting," and he would abandon fasting till one would say, "By Allah, he will never fast."
— Sahih Bukhari, Volume 3, Book 31: Fasting, Hadith #192
Narrated Ibn 'Abbas: The Prophet never fasted a full month except the month of Ramadan, and he used to fast till one could say, "By Allah, he will never stop fasting," and he would abandon fasting till one would say, "By Allah, he will never fast."
This hadith is from the book of Fasting in Sahih Bukhari, compiled by Imam al-Bukhari. It is hadith number 192 in book 31 of volume 3.
This hadith is referenced in the following topics: Rules of Fasting.
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