Distinguishing a particular night with worship
Question: Some people seek Laylatul-Qadar so they active by offering their prayers and other forms of worship whilst they do not do likewise on other nights in Ramadhaan, so is this in accordance with that which is correct?
Response: No! It is not in accordance with that which is correct, for certainly Laylatul-Qadar changes. So it could be on the night of the twenty seventh, and it could be on any other night as has been indicated in many ahaadeeth. It has been confirmed that the Prophet (sal-Allaahu `alayhe wa sallam) said: ((In that particular year Laylatul-Qadar was revealed on the night of the twenty first)). Therefore it is not befitting for a person to specify his stand (in prayer) on a particular night or distinguish a night which he yearns to be Laylatul-Qadar (likewise). (Rather) striving in all of the last ten nights is from the guidance of the Prophet (sal-Allaahu `alayhe wa sallam), since when the last ten nights arrived he would tighten his waist belt and awaken his family and used to spend them all awake (in worship). So that which is befitting for the prudent believer is to strive in all of the last ten nights such that the reward does not pass him by.
Shaykh Ibn al-Uthaymeen
Fataawa Ramadhaan - Volume 2, Page 855, Fatwa No.844;
Fiqh al-Ibaadaat libni 'Uthaymeen - Page 207
http://www.fatwa-online.com/fataawa/.../0000106_5.htm