[3:121] And when you went forth at dawn from your family to assign the believers their places for battle, and God hears, knows.
He put [the Prophet] (ṣ) in charge of assigning the places for battle, delegating him by His command. Then he made manifest in the matter the hidden things of His secret. The axis [of the action] revolved upon His decree and His deliberative power, and the lesson learned (iʿtibār) was by what He brought about and chose.