Dealing honorably in business is the acid test for whether religion is truly relevant. Many have a mistaken idea of what is within the scope of Jewish tradition.
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And if your brother is not near to you and you don’t know who he is, then you must take it into your house and it should remain with you until your brother seeks it, then you shall return it to him
Deuteronomy 22:2 –
לֹא־יִהְיֶ֥ה לְךָ֛ בְּבֵיתְךָ֖ אֵיפָ֣ה וְאֵיפָ֑ה גְּדוֹלָ֖ה וּקְטַנָּֽה׃
דברים כ״ה:יד
You must not keep in your house two different measures, one large and one small
Deuteronomy 25:14 –
One must not have inaccurate weights and measure in one’s home, even if one is not planning on using them for business
Maimonides, Mishneh Torah, Laws of Theft, 7:3
אֶ֣בֶן שְׁלֵמָ֤ה וָצֶ֙דֶק֙ יִֽהְיֶה־לָּ֔ךְ אֵיפָ֧ה שְׁלֵמָ֛ה וָצֶ֖דֶק יִֽהְיֶה־לָּ֑ךְ לְמַ֙עַן֙ יַאֲרִ֣יכוּ יָמֶ֔יךָ עַ֚ל הָֽאֲדָמָ֔ה אֲשֶׁר־יְהֹוָ֥ה אֱלֹהֶ֖יךָ נֹתֵ֥ן לָֽךְ׃
דברים כ״ה:ט׳׳ו
You must have completely honest weights and completely honest measures, if you are to endure long on the soil that the Hashem your God is giving you
Deuteronomy 25:15 –