Mishkat al-Masabih #1393

Abu Huraira reported God's Messenger as saying, "There are no days on which God likes better to be worshipped than the ten days of Dhul Hijja. Fasting observed on each of these days is equivalent to a year’s fasting, and prayer during each of these nights is equivalent to prayer during Lailat al-qadr.’* * A night towards the end of Ramadan. See Book 7, Chap. 9. Tirmidhi and Ibn Majah transmitted it, but Tirmidhi said its isnad is weak.