Rasulullah (Salallahu Alaihi Wasallam) said: “There are no days in which Ibadah is more beloved to Allah Ta’ala than the first ten days of Zul-Hijjah. The fast of each day is equivalent to the fast of one year and the Ibadah of each night is equivalent to the Ibadah of Laylatul Qadr.” (Tirmizi)
Recommended for those making Qurbani
It is Mustahab (recommended - not compulsory) for those making Udhiya (Qurbani) to abstain from removing any hair of the body and from clipping the nails from the first of Zul-Hijjah until completing the Qurbani.
It is Wajib (compulsory) to recite the Takbeer once after every Fard Salah beginning from Fajr of the 9th Zul-Hijjah till Asr of the 13th Zul-Hijjah.
NB: Women should also read the Takbeer (in a soft voice).
Fasting on the 9th
It is highly rewarding to fast during the first nine days of Zul-Hijjah, especially the 9th (Day of Arafaat).