The LORD hath made bare his holy arm in the eyes of all the nations; and all the ends of the earth shall see the salvation of our God.
The Lord hath made bare his holy arm - metaphor from wanders who bare their arm for battle (Ezekiel 4:7).
All ... earth shall see the salvation of our God. The deliverance performed by God for Israel will cause all nations to acknowledge the Lord (Isaiah 66:18-20). The partial fulfillment (Luke 3:6) is a forerunner of the future complete fulfillment.