וְעֹ֤֥שֶׂה חֶ֖֙סֶד֙ לַֽאֲלָפִ֑֔ים לְאֹהֲבַ֖י וּלְשֹׁמְרֵ֥י מצותו [מִצְוֺתָֽי׃] (ס)
나를 사랑하고 내 계명을 지키는 자에게는 천대까지 은혜를 베푸느니라
Mishneh Torah, Negative Mitzvot
Not to swear needlessly, as it is said, “Thou shalt not take the name of the Lord, thy God, in vain” (Ex. 20:7).