Reference for Psalms 136:22

נַ֭חֲלָה לְיִשְׂרָאֵ֣ל עַבְדּ֑וֹ כִּ֖י לְעוֹלָ֣ם חַסְדּֽוֹ׃

Even a heritage unto Israel His servant, For His mercy endureth for ever.

BDB