It is considered recommended (mustahabb) to fast on the first nine days of Dhu al-Hijjah. One may fast all of these days or only some of them.
The ninth day of Dhu al-Hijjah, known as the Day of Arafah, holds special significance in Islam. Regarding fasting on this day, the Prophet Muhammad (peace be upon him) said, “I hope from Allah that fasting on the Day of Arafah will expiate for the sins of the previous and coming year.” (Muslim, Sawm, 196-197 [1162]). However, it is more appropriate for those performing Hajj not to fast on the Day of Arafah, so that their acts of worship are not hindered and they do not experience hardship or weakness. (Abu Dawud, Sawm, 63 [2440]; Ibn Majah, Sawm, 40 [1732])
Source: T.C. Diyanet İşleri Başkanlığı, Din İşleri Yüksek Kurulu
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