'Arm' in the Bible

Therefore say unto the children of Israel, I am Jehovah, and I will bring you out from under the burdens of the Egyptians, and I will deliver you from their service, and I will redeem you with a stretched-out arm, and with great judgments.

Fear and dread fall upon them; By the greatness of thine arm they are still as a stone; Till thy people pass over, Jehovah, Till the people pass over that thou hast purchased.