וְעֹ֤֥שֶׂה חֶ֖֙סֶד֙ לַֽאֲלָפִ֑֔ים לְאֹהֲבַ֖י וּלְשֹׁמְרֵ֥י מצותו [מִצְוֺתָֽי׃] (ס)
and showing mercy unto the thousandth generation of them that love Me and keep My commandments.
Read midrashic interpretation of Deuteronomy 5:10: and classical rabbinic exegesis.