כִּי־ט֣וֹב יְ֭הֹוָה לְעוֹלָ֣ם חַסְדּ֑וֹ וְעַד־דֹּ֥ר וָ֝דֹ֗ר אֱמוּנָתֽוֹ׃
대저 여호와는 선하시니 그 인자하심이 영원하고 그 성실하심이 대대로 미치리로다
Rashi on Psalms
and until generation after generation His faith will endure. Every expression of truth (אמת) and faith (אמונה) means the realization of a promise, that He makes true and assures His promise.