en_tn/psa/103/017.md

the covenant faithfulness of Yahweh is

The abstract noun "faithfulness" can be translated with an adjective. Alternate translation: "Yahweh is faithful to his covenant" (See: rc://en/ta/man/jit/figs-abstractnouns)

is from everlasting to everlasting

This means that Yahweh's love continues forever. Alternate translation: "will continue forever" (See: rc://en/ta/man/jit/figs-merism)

their descendants

"the descendants of those who honor him"