Negative Commandment 253 (Digest)
Cheating a Convert
"Do not distress him"—Exodus 22:20.
It is forbidden to cheat a convert in the course of commerce [by deceptively overcharging or underpaying for merchandise]. Though it is forbidden to cheat anyone, one who cheats a convert transgresses this additional prohibition, too.
The 253rd prohibition is that we are forbidden from causing financial damage to a convert.
The source of this prohibition is G‑d's statement, "Do not oppress him."
In the words of the Mechilta: "The verse 'Do not oppress him' means to do so financially."
It has already been explained in tractate Bava Metzia that one who [verbally] causes distress to a convert transgresses the prohibitions "V'lo sonu one another" and "Do not wrong a convert." One who oppresses him [financially] transgresses the prohibition, "Do not oppress him," in addition to the general prohibition that includes all Jews, ona'as mamon.
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