Yes, fasting three days of every month is a recommended practice, and the Prophet (peace and blessings be upon him) informed us that fasting three days of every month is fasting the whole year, but
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The questioner : The questioner, in her last question, says: I fast the white days of every month, the thirteenth, fourteenth, and fifteenth, but sometimes my menstrual period coincides with them. Is it permissible for me to fast three other days instead of them in the same month?
The Shaykh : Yes, fasting three days of every month is a recommended practice, and the Prophet (peace and blessings be upon him) informed us that fasting three days of every month is fasting the whole year. However, it is better for them to be the white days, the thirteenth, fourteenth, and fifteenth. If that is not possible, because the woman has her menstrual period, or because of travel, or a guest, or boredom, or a minor illness, or something similar, then the reward is obtained by whoever fasts on days other than these three. Aisha (may Allah be pleased with her) said: "The Prophet (peace and blessings be upon him) used to fast three days of every month, and he did not care whether he fasted them at the beginning of the month, in the middle, or at the end." So the matter is broad in this regard; fasting three days of every month is a recommended practice, whether at the beginning of the month, in the middle, or at the end. But having them be the three white days is better. If that is missed due to an excuse or a need, then we hope that Allah the Exalted will record the reward for whoever it is his custom to fast them but he left them off for an excuse. Yes.
The questioner : May Allah reward you with good.
The Shaykh : Yes, fasting three days of every month is a recommended practice, and the Prophet (peace and blessings be upon him) informed us that fasting three days of every month is fasting the whole year. However, it is better for them to be the white days, the thirteenth, fourteenth, and fifteenth. If that is not possible, because the woman has her menstrual period, or because of travel, or a guest, or boredom, or a minor illness, or something similar, then the reward is obtained by whoever fasts on days other than these three. Aisha (may Allah be pleased with her) said: "The Prophet (peace and blessings be upon him) used to fast three days of every month, and he did not care whether he fasted them at the beginning of the month, in the middle, or at the end." So the matter is broad in this regard; fasting three days of every month is a recommended practice, whether at the beginning of the month, in the middle, or at the end. But having them be the three white days is better. If that is missed due to an excuse or a need, then we hope that Allah the Exalted will record the reward for whoever it is his custom to fast them but he left them off for an excuse. Yes.
The questioner : May Allah reward you with good.