Look

"Behold!" or "You should know!" Yahweh tells the people to pay attention.

Yahweh's hand is not so short

"Hand" represents power and ability. A "short" hand does not have power and ability. Alternate translation: "Yahweh is fully able" (See: rc://en/ta/man/jit/figs-metonymy and rc://en/ta/man/jit/figs-metaphor)