(13) And He said to Abram, “Know well that your offspring shall be strangers in a land not theirs, and they shall be enslaved and oppressed four hundred years;

(20) And a stranger shalt thou not wrong, neither shalt thou oppress him; for ye were strangers in the land of Egypt.

(20) כי גרים הייתם FOR YE WERE STRANGERS — ...Wherever גר occurs in Scriptures it signifies a person who has not been born in that land (where he is living) but has come from another country to sojourn there.

A male convert that marries a Jewish woman, or a female convert that marries a male Jew: their child is considered fully Jewish regarding all things, and cannot marry a mamzer.

(9) And a stranger shalt thou not oppress; for ye know the heart of a stranger, seeing ye were strangers in the land of Egypt.

It is a positive commandment to give tzedakah ...And there is a negative commandment in one who turns his eyes away, as it is said: “You shall not harden your heart nor shut your hand” (Devarim 15:7). And all who avert their eyes are called wicked, and it’s as if their worship is idol worship. And one must be punctilious about this, because it is may lead to bloodshed, that the poor person who asks will die if none give to him...

(16) Thou shalt not deliver unto his master a bondman that is escaped from his master unto thee;

We should build a wall around the roofs and around the pits and the ditches and that which is similar to them, so that no creature should stumble to fall in them or from them. And included in this commandment is to build and fix every wall and fence from which it is likely that there come an accident from it ...a person must guard himself from the accidents that are customary in the world.

In the case of a certainty vs. a possibility, we prefer to follow the certainty...