Halakhah su Esodo 22:20

To not oppress the convert with words: That we have been prevented from oppressing converts, even [only] with words - and that is one from the [other] nations who converted and entered our religion - such that is forbidden for [one] to disgrace him even with words, as it is stated (Exodus 22:20), "and you shall not oppress a convert." And even though we are warned about this with [Jews] and since this one entered our religion, behold is like [any other Jew], Scripture added a warning to us and also redoubled the prohibition for him, as it is written (Leviticus 19:33), "do not oppress" another time; because the issue of oppression is more relevant to a convert than it is to [another Jew], as [another Jew] has redeemers who will redress his insult. And there is another reason, [and that is] because there is a concern that [the convert] might return to his deviance out of anger over the disgraces. And they said in the Sifra (Sifra, Kedoshim, Chapter 8:2) that one shouldn't say, "Yesterday you were an idolater and now you entered under the wings of the Divine Presence."

To not oppress the convert regarding money: That we have been prevented to not oppress the convert regarding money - that if we have give and take (business matters) with him, to not oppress him - as it is stated (Exodus 22:20), "you shall not pressure him." And they said in the Mekhilta d'Rabbi Yishmael 22:2, "'You shall not pressure him' is regarding money." And this negative commandment is in addition to the negative commandment in which he is included with all of Israel, as they are [covered] by the [that] negative commandment of monetary oppression. And they are warned about him [both] regarding words and regarding money, due to the reason that we have written. All of its statutes are in the commandment that preceded this (Sefer HaChinukh 63). And in the negative commandment of monetary oppression of Israel (Sefer HaChinukh 337), we will write a few of the details of fraud, with God's help (see Tur, Choshen Mishpat 307).

To not abuse the orphan and the widow: That we have been prevented from burdening - by action or even by speech - the orphans and the widows, as it is stated (Exodus 22:20), "Every widow and orphan you shall not abuse." Rather, all of a person's give and take (business matters) with them should be calm and with kindness and pity.