Sahih Muslim Book 6, Hadith Number 2543.

Chapter : Disapproval of fasting on Friday alone.

Muhammad b. ‘Abbas b. Ja’far reported: I asked Jabir b. ‘Abdullah (Allah be pleased with both of them) as he was circumambulating the House (Ka’ba) whether the Messenger of Allah (may peace be upon him) had forbidden the fasting on Friday, whereupon he said: Yes, by the Lord of this House.