You have enlarged the nation.
You have increased their joy.
They rejoice before you
as with the joy in harvest,
as men rejoice when they are dividing up the spoil. Bible

“have enlarged...have increased.” God will enlarge the nation in the future, but it is written about as if it had already happened to emphasize that it will happen. This is the idiom of the prophetic perfect (see commentary on Isa. 9:1).

Commentary for: Isaiah 9:3