SHAFAQNA – It has been mentioned that the night of Qadr could be one of the nights before 19th, 21st and 23rd of the month of Ramadhan and sometimes the 27th has also been mentioned. Imam Baqer (AS) used to pray all night the nights before 21st and 23rd of Ramadhan until morning and then performed his morning (Fajr) Salaat. According to Imam Sadeq (AS), Lailatul Qadr (the Night of Qadr) is the heart of the month of Ramadhan and we must do our best to understand it and do not waste the opportunity [2, 3].
 Kafi, Vol. 4 (printed by Alislamieh), Page 155.
 Kafi, Vol. 4, page 66.
 Man Layahzarahul Faqih, Vol. 2, page 99, hadith Number 1843.