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The Prophet (ﷺ) 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."

"The Messenger of Allah would fast until we said he would not break his fast, and he would not fast until we said he does not want to fast. And he never fasted any month in full apart from Ramadan, from the time he came to Al-Madinah."

"The Prophet (ﷺ) used to fast until we would say: “He does not intend to break fast [during the month],” and he used to break fast until we would say: “He does not intend to fast during it.” He did not fast for a whole month after arriving