Lailatul Qadr (The Night of Decree)! *On that night, EVERY decreed matter for the entire year will be conveyed*
(Therein (that night) is decreed every matter, Hakim.) means, on Laylatul-Qadr, the decrees are transferred from Al-Lawh Al-Mahfuz to the (angelic) scribes who write down the decrees of the (coming) year including life span, provision, and what will happen until the end of the year. This was narrated from Ibn `Umar, Mujahid, Abu Malik, Ad-Dahhak and others among the Salaf.