´It was narrated that Hafsah said:` "There are four things which the Prophet never gave up: Fasting 'Ashura', (fasting during) the ten days, (fasting) three days of each month, and praying two Rak'ahs before Al-Ghadah (Fajr)."
Explanation & Benefits
Hafiz Muhammad Ameen
Urdu footnote:
"The fasts of Dhul-Hijjah." In the hadith, ten days are mentioned, but what is meant are nine days, because the tenth day is the day of Eid. And it is absolutely prohibited to fast on the day of Eid. By way of predominance, the nine are referred to as ten days. In the following hadith, only nine are mentioned.
Source: Sunan Nasa'i: Translation and Benefits by Shaykh Hafiz Muhammad Amin Hafizullah, Page: 2418