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 Verdicts, 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
Published: 9 December 1999