שוב מעשה בנכרי אחד שהיה עובר אחורי בית המדרש ושמע קול סופר שהיה אומר (שמות כח, ד) ואלה הבגדים אשר יעשו חושן ואפוד אמר הללו למי אמרו לו לכהן גדול אמר אותו נכרי בעצמו אלך ואתגייר בשביל שישימוני כהן גדול בא לפני שמאי אמר ליה גיירני על מנת שתשימני כהן גדול דחפו באמת הבנין שבידו בא לפני הלל גייריה
On another occasion it happened that a certain heathen came before Shammai and said to him, 'Make me a proselyte, on condition that you teach me the whole Torah while I stand on one foot.' Thereupon he repulsed him with the builder's cubit which was in his hand.<span class="x" onmousemove="('comment',' Rashi: a cubit to measure off the amount of work done by a builder.
');"><sup>12</sup></span> When he went before Hillel, he said to him, 'What is hateful to you, do not to your neighbour:<span class="x" onmousemove="('comment',' The golden Rule; cf. Lev. XIX, 18: but thou shalt love thy neighbour as thyself.- V. Hertz, Leviticus, pp. 22 or 223, and cf. R. T. Herford, Talmud and Apocrypha, p. 148.
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Kitzur Shulchan Arukh
You should be extremely careful not to deceive your fellow man. If anyone deceives his fellow, whether a seller deceives a buyer, or a buyer deceives a seller, he transgresses a negative commandment, for it is said:1Leviticus 25: 14. "When you sell something to your neighbor, or buy from your neighbor, do not deceive one another." The first question a person is asked when he is brought before the [Heavenly] Court is: "Have you [always] been honest in your dealings?"2Shabbos 31a.
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Sefer HaChinukh
The commandment of love of Israel: To love [with] love of the soul each one of Israel - meaning to say that we have compassion for an Israelite and for his money, [just] like a person has compassion for himself and for his [own] money; as it stated (Leviticus 19:18), "you shall love your neighbor as yourself." And they, may their memory be blessed, said (Shabbat 31a), "What is hateful to you, do not do to your fellow." And they said in Sifra, Kedoshim, Chapter 4:12, "Rabbi Akiva said, 'This is a great principle in the Torah'" - meaning to say that many commandments are dependent upon it. As one that loves his fellow like himself will not steal his money, have adultery with his wife, cheat his money from him nor hurt him from any angle. And so [too,] are there several other commandments dependent on this - the thing is well-known [revealed] to all who have intellect.
