💐 In The Name Of Allah The Most Gracious The Most Merciful
🗒️ Allah the Almighty knows best. It is allowed to fast on a Friday, to complete one's obligatory fasts in Ramadan or continue the Sunnah fasting of six days of Shawwaal, as long as one fasts the day before (Thursday) and/or after it (Saturday).
📖 Abu Huraira RadhiAllahu 'anhu narrated: Allah's noble Messenger Muhammad SallAllahu 'alaihi wa sallam said, "Do not single out the night of Friday for voluntary prayer (Tahajjud) to the exclusion of other nights. Do not single out the day of Friday for fasting to the exclusion of other days, unless it is the routine of one of you."
In another narration, the Prophet SallAllahu 'alaihi wa sallam said, "Let not one of you fast on Friday unless he also fasts a day before or after it."
Source: Sahih Muslim 1144
Grade: Sahih (Authentic) according to Muslim
https://binbaz.org.sa/fatwas/28886/%D8%B5%D9%8A%D8%A7%D9%85-%D9%8A%D9%88%D9%85-%D8%A7%D9%84%D8%AC%D9%85%D8%B9%D8%A9-%D9%81%D9%8A-%D8%BA%D9%8A%D8%B1-%D8%B1%D9%85%D8%B6%D8%A7%D9%86-%D9%83%D8%B5%D9%8A%D8%A7%D9%85-%D8%A7%D9%84%D9%82%D8%B6%D8%A7%D8%A1-%D8%A7%D9%88-%D8%A7%D9%84%D9%83%D9%81%D8%A7%D8%B1%D8%A9