As Excellent As Laila-tul-Qadr
It is mentioned in a blessed Hadis that ALLAH Like to be worshipped during the (first) ten days of Zul-Hijjah more than any other day. The fast of any one of these days is equivalent to a year"s fasts and the night Salah during any one of these nights is equivalent to that of Laila-tul-Qadr.
(Sunan Tirmidhi, vol. 2, pp. 192, Hadis 758)