Hadith 14:263
Abu Bakr narrated to us, he said: Hafs narrated to us, from Hajjaj, he said: The Messenger of Allah (may Allah bless him and grant him peace) said: "Whoever is to be cupped, let him be cupped on Saturday."
حدثنا أبو بكر قال حدثنا حفص عن حجاج قال قال رسول الله صلى الله عليه وسلم من كان محتجما فليحتجم يوم السبت