Halakhah su Levitico 18:2

And let it not be difficult to you [that], if so that we do not say like the words of the translator (Onkelos) - from which verse do we learn the negative commandment of marrying a maidservant? And lest you say, from that which it is written (Deuteronomy 7:3), "Do not get married with them" - that is not [correct], as behold, it is explained in the Gemara that this is coming [specifically] for the seven [Canaanite] nations, and about them is it written. And [it is speaking about] specifically in their conversion; as in their gentileness, the expression, "marriage," is not applicable - and as we will write with God's help in its place, in the Order of Ve'etchanan (Sefer HaChinukh 427). But it is possible to say that we learn the prohibition of a maidservant as included in the prohibition of all the nations that are not Israelites, that it is prohibited to cling to them. And [it is] like the Sages expounded (Kiddushin 68b) from that which is written (Deuteronomy 7:4), "For they will remove your son from after Me" - to include all who remove. And likewise, a Canaanite maidservant is included in those who remove, since she is not a full Israelite; as behold, there are some commandments about which she is not obligated. And those are the ones in the section of the Torah in which it is explicitly written, "Speak to the Children of Israel" (e. g. Leviticus 18:2), to exclude anyone who is not from the Children of Israel, as it is explained in the Gemara in a few places. And with this, they are included in those that remove.