Rasulullah Sallallahu Alayhi wa Sallam has said, “There is no time when pious actions are more loved by Allah than during the first ten days of Zul-Hijjah.”The Sahaabah Radhiyallahu Anhum enquired, “Is it greater than even Jihad in the path of Allah?” Rasulullah Sallallahu Alayhi wa Sallam replied, “It is even greater than Jihad except that Jihad where a person sacrifices his possessions and even his life in the path of Allah.”(Tirmizi)
The Fast of Youmul Arafah
The 9th day of Zul Hijjah is called Yowmul-Arafah. This is the date when the Hujjaj assemble on the plains of Arafat, where they perform the most essential duty of Hajj, the Wuqoof of Arafah.
The fast of Yowmul Arafah has been prescribed by Rasulullah Sallallahu Alayhi wa Sallam as a most meritorious act. According to the Hadith, the fast of this day is a cause of forgiveness for sins committed in the past and future year.(Muslim)
Clipping of nails & Removal of hair
It is Mustahab (preferable, but not obligatory) for a person performing Qurbani to abstain from trimming/removing hair or clipping nails from the commencement of Zul Hijjah to the time he slaughters his Qurbani animal. Hence, hair and nails should be removed prior to the commencement of Zul-Hijjah.