1. You are not to exploit or oppress the foreign resident, because you were residents in Egypt (Exodus 22:20).
You are not to oppress the foreign resident; for you understand the soul (feelings) of the foreign resident, because you were foreign residents in Egypt (Exodus 23:9).

2. And you are to rejoice before GOD your God, you, your son and your daughter, your slave and slave-woman, the Levite, ... the foreign resident; the orphan and the widow among you ... and you are to remember that you were a slave in Egypt (Deuteronomy 16:11-12).
So that your slave and slave-woman may rest like yourself, and you are to remember that you were a slave in Egypt (Deuteronomy 5:13).

3. You are to provide him from your flocks ... that which GOD your God has blessed you with you are to give him, and you are to remember that you were a slave in Egypt ... for which reason I am commanding you today to do this. (Deuteronomy 15:14-15).

4. You are not to compel [the slave] to do excessively hard labour (Leviticus 25:43).