1. Allah has taken oath of ten nights in Surah Al-Fajr. According to the majority of the commentators of Qur’ãn, the nights are those of the (first) ten days of Zul Hijjah.
2. Abdullah Ibne ‘Abbãs radiyallahu anhu related that the Prophet sallalahu alayhi wasallam said, “Good deeds performed on other days are not superior to those performed on these (first ten days of Zul Hijjah).” The Companions radiyallahu anhum inquired, “Not even Jihãd?” He replied, “Not even jihãd, except for that person who goes out putting himself and his wealth in danger and does not return with anything.” (Bukhãri)
3. Abdullah Ibne ‘Abbãs radiyallahu anhu narrated that Rasulullah sallalahu alayhi wasallam said, “On no other days are good deeds more liked by Allah than on these ten days (i.e. The first ten days of Zul Hijjah).” The Sahãbah radiyallahu anhum asked, ” O Rasulullah ! Not even Jihãd in the Way of Allah?” Rasulullah sallalahu alayhi wasallam replied, “Not even Jihãd in the Way of Allah, except for that person who goes out with his life and wealth and does not return with anything.” (Abu Dãwud, Tirmidhi, Ibne Mãjah)
4. Abu Hurayrah radiyallahu anhu related that Rasulullah sallalahu alayhi wasallam said, “On no days is the worship of Allah desired more than in the (first) ten days of Zul Hijjah. The fast of each of these days is equal to the fast of a whole year, and the worship of each of these nights is equal to the worship of Laylatul Qadr.” (Tirmidhi, Ibne Mãjah)
5. The mother of the believers, Hafsah radiyallahu anhaa reports that Rasulullah sallalahu alayhi wasallam used to fast the (first) nine days of Zul Hijjah. (Nasã’i, Ahmad, Abu Dãwud)
6. Abdullah Ibne ‘Umar radiyallahu anhu related that Rasulullah sallalahu alayhi wasallam said, “No days are as weighty with Allah and so liked by Him for good deeds than the first ten days of Zul Hijjah. So on these days increasingly read Subhãnallah, Lã ilãha illallãh, Alhamdulillah and Allahu Akbar.” (Musnad Ahmad)