Leviticus 25:17

ולא תונו איש את עמיתו YE SHALL NOT THEREFORE BE EXTORTIONATE TO ONE ANOTHER — Here Scripture warns against vexing by words (wounding a person’s feelings) — that one should not annoy his fellow-man, nor give him an advice which is unfitted for him, but is in accordance with the plan and the advantage of the adviser. But lest you should say, “Who knows whether I had any intention to do him evil?” Scripture therefore states: “but thou shalt fear thy God”! — He Who knows men’s thoughts, He knows it! In all cases where it is a matter of conscience (more lit., a matter handed over to the heart), when no one knows the truth except the one who has the thought in his heart, Scripture always states: “but be afraid of thy God”! (Sifra, Behar, Chapter 4 1-2; Bava Metzia 58b; cf. also Rashi on Leviticus 19:14.)

You shall not therefore defraud one another; but thou shalt fear thy God: for I am the Lord your God.

וְלֹ֤א תוֹנוּ֙ אִ֣ישׁ אֶת־עֲמִית֔וֹ וְיָרֵ֖אתָ מֵֽאֱלֹהֶ֑יךָ כִּ֛י אֲנִ֥י יְהֹוָ֖ה אֱלֹהֵיכֶֽם׃