Yahweh acting faithfully towards the people is spoken of as if Yahweh's covenant faithfulness were with them. The abstract noun "faithfulness" can be translated with an adverb. Alternate translation: "May you always act faithfully towards us because of your covenant, Yahweh" (See: [[rc://en/ta/man/translate/figs-metaphor]] and [[rc://en/ta/man/translate/figs-abstractnouns]])