What is the first hour the Messenger of Allah, peace and blessings be upon him, spoke of regarding the reward for going early to Friday prayer?

Scholars have differed in determining the hour mentioned. Some are of the view that it begins at the start of the day (dawn or sunrise), and this is the opinion of the majority. Others have gone to say that it refers to delicate moments that begin with the sun's decline, and this is the opinion of the Malikis.