💐 In The Name Of Allah The Most Gracious The Most Merciful
It is allowed and permissible to fast Sunnah fasting on a Friday as long as one fasts a day before and/or after it, such as fasting on the 13th, 14th (today Friday February 26 2021, Rajab 14, 1442) and 15th (the three white days / ayyaam al-beedh of each month) and fasting to compensate for missed obligatory fasts.
📖 Narrated Abu Huraira RadhiAllahu 'anhu narrated: My friend (the Prophet Muhammad SallAllahu 'alaihi wa sallam) advised me to observe three things: To fast three days of each month; to pray two rak'aat of Duha prayer (forenoon prayer); and to pray Salat Al-Witr before sleeping."
Sahih Al-Bukhari 1981 In-book reference: Book 30, Hadith 88 USC-MSA web (English) reference: Vol. 3, Book 31, Hadith 202
📖 Abu Dharr RadhiAllahu 'anhu narrated: Allah's noble Messenger Muhammad SallAllahu 'alaihi wa sallam said, "O Abu Dharr, if you are going to fast three days of the month, then fast on the thirteenth, fourteenth, and fifteenth days."
Source: Sunan At-Tirmidhi 761
Grade: Sahih (Authentic) according to Al-Albani
📖 Abu Huraira RadhiAllahu 'anhu narrated: Allah's noble Messenger Muhammad SallAllahu 'alaihi wa sallam said, "The deeds are presented on Monday and Thursday. Thus, I love for my deeds to be presented while I am fasting."
Source: Sunan At-Tirmidhi 747
Grade: Sahih (Authentic) according to Al-Albani
📖 Sahl ibn Sa’d RadhiAllahu 'anhu narrated: Allah's noble Messenger Muhammad SallAllahu 'alaihi wa sallam said, "Verily, there is a gate in Paradise called Ar-Rayyaan, through which only those who fasted will enter on the Day of Resurrection. No one else will enter it along with them. It will be said: 'Where are those who fasted, so that they may enter?' When the last of them enter, it will be closed and no one else will go through it."
Source: Sahih Al-Bukhari 1797
Sahih Muslim 1152
Grade: Muttafaqun Alayhi (Authenticity agreed upon) according to Al-Bukhari and Muslim
📖 Abu Sa’eed Al-Khudri RadhiAllahu 'anhu narrated: Allah's noble Messenger Muhammad SallAllahu 'alaihi wa sallam said, "Whoever fasts a day in the way of Allah, Allah will move his face away from the Hellfire by a distance of seventy years."
Source: Sahih Al-Bukhari 2685
Sahih Muslim 1153
Grade: Muttafaqun Alayhi (Authenticity agreed upon) according to Al-Bukhari and 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