It wasnarrated from Abu Hurairah that the Messenger of Allah (ﷺ)said:
"There are no days in this world during which worship is morebeloved to Allah, Glorious is He, than the (first) ten days (ofDhul-Hijjah). Fasting one of these days is equivalent to fasting foroneyear, and one night of them is equal to Lailatul-Qadr." (FR)
English reference (FR): Vol. 1, Book 7, Hadith 1728 (FR)
Arabic reference (FR): Book 7, Hadith 1800 (FR)