The writer speaks of Yahweh's covenant faithfulness as if it were a person whom he commands to be with him. The abstract noun "faithfulness" can be translated as an adjective. Alternate translation: "Yahweh will show me his covenant faithfulness in the daytime" or "Yahweh will show me in the daytime how faithful he is to his covenant" (See: [[rc://en/ta/man/jit/figs-metaphor]])