Rambam - Sefer HaMitzvos: Negative Mitzvah 253: Negative Mitzvah 253

Negative Mitzvah 253: It is forbidden to cheat a convert in business
Exodus 22:20 "We are forbidden to cheat a convert in business deals"

In any case involving business deals, buying or selling, it is forbidden to cheat the convert.

The Torah gives us a special commandment in regard to the Ger in order to make sure that we treat any convert to Judaism just as we would treat any other Jew.

Nothing is greater than peace. Even when you are 100% right, and you know your spouse is 100% wrong, you can still give in for the sake of peace.

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Better a difficult peace than an easy quarrel.

From: Bringing Heaven Down to Earth by Tzvi Freeman - tzvif@aol.com