מֹ֧אזְנֵי צֶ֣דֶק אַבְנֵי־צֶ֗דֶק אֵ֥יפַת צֶ֛דֶק וְהִ֥ין צֶ֖דֶק יִהְיֶ֣ה לָכֶ֑ם אֲנִי֙ יְהוָ֣ה אֱלֹֽהֵיכֶ֔ם אֲשֶׁר־הוֹצֵ֥אתִי אֶתְכֶ֖ם מֵאֶ֥רֶץ מִצְרָֽיִם׃
Balanças justas, pesos justos, uma eifa justa, e um hin justo terão convosco; Eu sou Hashem, vosso Deus, que vos tirei da terra de Mitzrayim.
Jerusalem Talmud Maaser Sheni
Rebbi Ezra asked before Rebbi Mana: Is it the same for a gift127Are the rules of agency for receiving a gift the same as for receiving a bill of divorce.? Can a person appoint an agent for something that is not his? He said to him, there the Torah gave her the right to a bill of divorce and she appoints an agent to receive what rightfully is hers128The husband cannot divorce her without handing her a bill of divorce.. Can you say in regard to a gift that a person can appoint an agent for something that is not his? 129From here to the end of the Halakhah, the text is also in Ševi‘it 10:9, Notes 133–134. In addition, from what Rebbi Yose, Rebbi Jacob bar Zavdi, Rebbi Abbahu in the name of Rebbi Joḥanan said, if somebody said to give a gift to another and he wants to take it back, he may take it back. Rebbi Yose stood near to Rebbi Jacob bar Zavdi and said to him, is that a just “yes”? They said, at the moment he said it, it was a just yes.