The writer repeats the phrase "Not to us" in order to emphasize that they are not worthy to receive the honor that is due only to Yahweh. If necessary, a verbal phrase may be supplied here. Alternate translation: "Do not bring honor to us, Yahweh" (See: [[rc://en/ta/man/jit/figs-doublet]])
The abstract noun "faithfulness" can be translated as an adjective. The abstract noun "trustworthiness" can be translated with a verbal phrase. Alternate translation: "because you are faithful to your covenant and you are worthy of people trusting you" (See: [[rc://en/ta/man/jit/figs-abstractnouns]])