לא תתחתן בם-הלכות חתונה עם גויים

(1) When a Jew engages in relations with a woman from other nations, [taking her] as his spouse or a Jewess engages in relations with a non-Jew as his spouse, they are punished by lashes, according to Scriptural Law. As [Deuteronomy 7:3] states: "You shall not intermarry with them. Do not give your daughter to his son, and do not take his daughter for your son."
This prohibition applies equally to [individuals from] the seven [Canaanite] nations and all other gentiles. This was explicitly stated in Ezra [Nechemiah 10:31]: "That we will not give our daughters to the gentiles in the land and that we will not take their daughters for our sons."

(52) Not to marry gentiles, as [Deuteronomy 7:3] states: "Do not marry among them."

(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.

(1) To not marry with idolaters: That we should not marry with the nations - and Rambam, may his memory be blessed, wrote (Mishneh Torah, Laws of Forbidden Intercourse 12:1), "Not with the seven nations and with the other nations" - as it is stated (Deuteronomy 7:3), "You shall not marry with them." And the matter of marriages is that he give his daughter to [the idolater's] son or his son to his daughter, and as the verse elucidates, "you shall not give your daughter to his son, and his daughter you shall not take for your son." And all the more so one who mates with them [himself], as he himself is included in this prohibition. And we say in Tractate Avodah Zarah 36b [that it is] by way of marriages that the Torah forbade. But even though this verse of "You shall not marry them" is written specifically about the seven nations and in their being converts - and so is it understood by our Rabbis, who said in the Gemara (Yevamot 76a), "In their being converts, they have marriages, in their being gentiles, they do not have marriages" - in that which the Scripture restates [that which is already understood], "you shall not give your daughter to his son, and his daughter you shall not take for your son," it [comes to] include the seven nations and all of the other nations even in their being gentiles. But the seven nations are forbidden even in their being converts because they were the main [source] of idolatry and its first foundation, whereas the other nations are permitted by conversion. But one who has sexual relations on occasion, such as a man who has sexual relations privately with his harlot - this is only a rabbinic prohibition, and it is the prohibition of nashgaz (the Hebrew initials of the four types of women included: menstruant, maidservant, gentile, harlot) mentioned in Avodah Zarah 76a.

(1) He prohibited us from marrying heretics. And that is His, may He be exalted, saying, "And you shall not marry them" (Deuteronomy 7:3). And he explained what marriage is - "do not give your daughters to their sons or take their daughters for your sons." And in the explanation (Avodah Zarah 36b), they said, "The Torah forbade [it when it is] by way of marriage." And there are distinctions about the punishment of one who transgresses this negative commandment. And that is that when the one who has sexual relations with an Aramean has sexual relations in public - anyone who kills him while he is clinging to the sin has carried out the punishment, as Pinchas did to Zimri (Numbers 25:6-8). And they said (Sanhedrin 81a), "One who has sexual relations with an Aramean, zealots may attack him" - but with the conditions that we mentioned. And that is that he has relations with her in public, and [that the punishment is meted out] at the time of the act - like the story that happened (with Pinchas and Zimri). But if he did not do this in public or he [already] separated and the zealots did not attack him, he is liable for excision. However this excision is not made clear in the Torah: They said, "[When] zealots did not attack him, what is [the law]?" And it is explained that it is excision (cutting off), from His saying, "for Judah has profaned what is holy to the Lord - what He loves - and espoused daughters of alien gods. The Lord will cut off from the man that does this all living offspring" (Malachi 2:11-12). [This] implies that it is with excision. However when it becomes confirmed about a man - with witnesses and a warning - that he had sexual relations with an Aramean, he is lashed, by Torah law. And know this. (See Parashat Vaetchanan; Mishneh Torah, Forbidden Intercourse 12.)