Is there a prohibition from the Prophet (peace and blessings be upon him) regarding fasting on Saturday alone, and what is the reason for this prohibition?

Question:
May Allah reward you, Honorable Shaykh. This questioner says: Is there a prohibition from the Prophet (peace and blessings be upon him) and what is the reason for this prohibition?

Answer:
It is not established. The prohibition was mentioned, but it is not established. The authentic ruling is the prohibition of fasting on Friday alone. The prohibition is reported in al-Bukhari regarding fasting on Friday alone, because it is a day of celebration, the day of the week, Friday is a day of celebration that marks the week, except for one who has a regular fast that includes Friday incidentally, in which case there is no harm. As for Saturday, the prohibition of fasting on it alone is not established; the prohibition of fasting on it alone is not established. Yes.