'Rear guard' in the Bible

For you will not go out in a hurry [as when you left Egypt],Nor will you go in flight [fleeing, as you did from the Egyptians];For the Lord will go before you,And the God of Israel will be your rear guard.

“Then your light will break out like the dawn,And your healing (restoration, new life) will quickly spring forth;Your righteousness will go before you [leading you to peace and prosperity],The glory of the Lord will be your rear guard.