Narrated Muhammad bin `Abbas: I asked Jabir "Did the Prophet (ﷺ) forbid fasting on Fridays?" He replied, "Yes." (Other narrators added, "If he intends to fast only that day)"
Book 30 · Hadith 91
صحيح البخاري
Narrated Muhammad bin `Abbas: I asked Jabir "Did the Prophet (ﷺ) forbid fasting on Fridays?" He replied, "Yes." (Other narrators added, "If he intends to fast only that day)"