'Arm' in the Bible

Therefore tell the children of Israel, 'I am Yahweh, and I will bring you out from under the burdens of the Egyptians, and I will rid you out of their bondage, and I will redeem you with an outstretched arm, and with great judgments:

Terror and dread falls on them. By the greatness of your arm they are as still as a stone -- until your people pass over, Yahweh, until the people pass over who you have purchased.