The Superiority of First 10 Day of Zulhijjah (Dhul-Hijjah)
Ibn Abbas RadiAllahuAnhu Narrated that : the Messenger of Allah (ﷺ) said: "There are no days in which righteous deeds are more beloved to Allah than those ten days." They said: "O Messenger of Allah (ﷺ)! Not even Jihad in Allah Cause?" The Messenger of Allah (ﷺ) said: "Not even Jihad in Allah's Cause, unless a man were to out with his self and his wealth and not return from that with anything."
[Jami` At-Tirmidhi 757]
Narrated Ibn `Abbas RadiAllahuAnhu: The Prophet (ﷺ) said, "No good deeds done on other days are superior to those done on these (first ten days of Dhul Hijjah)." Then some companions of the Prophet (ﷺ) said, "Not even Jihad?" He replied, "Not even Jihad, except that of a man who does it by putting himself and his property in danger (for Allah's sake) and does not return with any of those things."
[Sahih Al-Bukhari 969]
[Sunan Abu Dawood 2438]
[Sunan Ibn Majah 1727]