"He arranges each matter from the heaven to the earth," meaning: He sends it down with Gabriel from the heaven to the earth. "Then it will ascend to Him," meaning: it ascends; referring to Gabriel [returning] to the heaven, "during a day the extent of which is a thousand years" of the days of this world.

Yahya said: Between the heaven and the earth is a journey of five hundred years. So he descends the distance of five hundred years, and ascends the distance of five hundred years in a day, or even in less than a day. Sometimes the Prophet, peace be upon him, would be asked about a matter that had arisen, and it would descend faster than the blink of an eye.

Surah As-Sajdah, from verse 6 to verse 11.