Ten Best Days of Dhul-Hijjah by Sheikh Yasir Qadhi
The first ten days of Dhul-Hijjah:
Prophet (peace and blessings of Allaah be upon him) said: There are no days in which righteous deeds are more beloved to Allaah than these ten days. The people asked, Not even jihaad for the sake of Allaah? He said, Not even jihaad for the sake of Allaah, except in the case of a man who went out to fight giving himself and his wealth up for the cause, and came back with nothing. (Reported by al-Bukhaari, 2/457).
Virtues of the Ten Days of Dhul Hijjah.