Making up a fast of Ramadhaan on a Friday
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Question: If a person had one fast from Ramadhaan to make up, is it permissible for him to fast on a Friday?

Response: It is permissible for a Muslim to fast on a Friday if he is making up a fast from Ramadhaan, even if it is just one day.

And with Allaah lies all the success, and may Allaah send prayers and salutations upon our Prophet Muhammad (sal-Allaahu `alayhe wa sallam) and his family and his companions.

The Permanent Committee for Islaamic Research and Fataawa, comprising -
Head: Shaykh 'Abdul 'Azeez ibn Abdullaah ibn Baaz;
Deputy Head: Shaykh 'Abdur-Razzaaq 'Afeefee;
Member: Shaykh 'Abdullaah Ibn Ghudayyaan
Fataawa Ramadhaan - Volume 2, Page 662, Fatwa No.668;
Fataawa al-Lajnah ad-Daa.imah lil-Buhooth al-'Ilmiyyah wal-Iftaa. - Fatwa No.8966