"he is mighty and will save you." Yahweh is spoken of as a mighty warrior. Alternate translation: "he is a mighty warrior and will give you victory" (See: [[rc://en/ta/man/jit/figs-metaphor]])
These two phrases mean the same thing and are repeated to emphasize Yahweh's joy that the remnant is restored to him. (See: [[rc://en/ta/man/jit/figs-parallelism]])