Yahweh being faithful to a person and protecting that person is spoken of as if Yahweh's covenant faithfulness surrounded the person. The abstract noun "faithfulness" can be translated as an adjective. Alternate translation: "Because Yahweh is faithful to his covenant, he will protect the one who trusts in him" (See: [[rc://en/ta/man/jit/figs-metaphor]] and [[rc://en/ta/man/jit/figs-abstractnouns]])