Albert Barnes Commentary Job 38:5

"Who determined the measures thereof, if thou knowest? Or who stretched the line upon it?" — Job 38:5 (ASV)

Who has laid its measures — That is, as an architect applies his measures when he builds a house.

If you know — Or rather, “for you know.” The expression is entirely ironical and is designed to rebuke Job’s claims of being able to explain the divine administration.

Or who has stretched the line upon it — As a carpenter uses a line to mark out his work (see the notes at Isaiah 28:17). The earth is represented as a building, the plan of which was laid out beforehand, and which was then made according to the sketch of the architect. It is not, therefore, the work of chance or fate. It is laid out and constructed according to a wise plan and in a method demonstrating infinite skill.