Hadith 4:377
Ibn ‘Ulayyah narrated to us, from ‘Imran ibn Zabyan, from Hakim ibn Sa‘d, from ‘Ali ibn Abi Talib—may Allah honor his face—who said: "Whoever among you is to perform voluntary fasting during the month, let his fasting be on Thursday. And do not fast on Friday, for it is a day of food and drink and remembrance. Thus, Allah will combine two good days for him: the day of his fasting and the day of his worship with the Muslims."
حدثنا بن علية عن عمران بن ظبيان عن حكيم بن سعد عن علي بن أبي طالب كرم الله وجهه قال من كان منكم متطوعا من الشهر أياما فليكن صومه يوم الخميس ولا يصم ( ( ( يصوم ) ) ) يوم الجمعة فإنه يوم طعام وشراب وذكر فيجمع الله يومين صالحين يوم صيامه ويوم نسكه مع المسلمين