In our religion, there are days when fasting is commanded or recommended, as well as days when fasting is forbidden or not welcome. According to the nature and severity of the prohibition, fasting is haram or tahrîmen makruh on some of these days, and makrooh later elsewhere. Hz. The Prophet (peace and blessings of Allaah be upon him) stated that fasting is not allowed at two times, one of which is the first day of Ramadan and the other is the days of Eid al-Adha (Bukhari , Sawm, 66-67). Fasting is prohibited only on the first day of Eid al-Fitr and the four days of Eid al-Adha (Mevsili, al-Ihtiyâr, I, 395-396). The reason fasting is forbidden these days is that religious days are days of food, drink, and joy. The festival of Ramadan is like a “general iftar festival” that occurs after Allah’s fast for a month. For this reason, it was called “the feast of the fast.” In this sense, the first day of Ramadan is the iftar of a one-month Ramadan fast. Fasting on such a massive iftar day means not participating in God’s symbolic feast, which at least is not decent. The days of Eid al-adha, when sacrifices are sacrificed for Allah, are also holidays. Hz. The Prophet (peace and blessings of Allaah be upon him) declared that the days of pilgrimage are the days of eating, drinking and remembering Allaah (Abu Dawood, Sawm, 49). It would be more appropriate for them not to fast on the days of “Arafah”. Because Hz. The Prophet (peace be upon him) forbade those who were in Arafat on Arafat’s day from fasting (Abu Dawood, Sawm, 64). Because it is better to be fit and alive while doing Hajj than if you previously fasted in vain, and fasting on other days was considered makrooh for various reasons. E.g; Makruh is seen only because it means to fast on the day of âşûrâ (the 10th day of the month of Muharram), to resemble the Jews and imitate them (Abu Dawood, Salah, 66). It is makruh to fast on the day of doubt. Hz. The Prophet forbade Ramadan by fasting one or two days earlier (Bukhari, Sawm, 11, 14; Muslim, Siyam, 21; Abu Dawood, Sawm, 11). It is makruh to fast by adding it. This is called visâl fasting (saasm-i visâl). Hz. According to what Aisha said, Hz. The Prophet (peace be upon him) forbade them to fast. When reminded that he was fasting like this, he said: “You are not like me; My Lord makes me eat and drink. “(Muslim, Siyam, 55-58)