Jubilees 30:10
9 For thus has it been ordained and written in the heavenly tablets regarding all the seed of Israel: he who defileth (it) shall surely die, and he shall be stoned with stones. 10 And to this law there is no limit of days, and no remission, nor any atonement: but the man who has defiled his daughter shall be rooted out in the midst of all Israel, because he has given of his seed to Moloch, and wrought impiously so as to defile it. 11 And do thou, Moses, command the children of Israel and exhort them not to give their daughters to the Gentiles, and not to take for their sons any of the daughters of the Gentiles, for this is abominable before the Lord.
Pseudo Jonathan Leviticus 18:21
And unto the side of a woman in the time of the separation of her uncleanness thou shalt not draw nigh to dishonour her nakedness. Nor unto the side of thy neighbour's wife shalt thou come to defile her. And of thy offspring thou shalt not give up any to lie carnally with the daughters of the Gentiles, to perform strange worship; nor shalt thou profane the Name of thy God: I am the Lord. Nor with a male person shalt thou lie as with a woman; it is an abhorrent thing.
Notes and References
"... While pronouncing this general ban, the Interpolator was also seeking—as so often—to connect an incident in Genesis (the Dinah story) and a later law of the Torah with what is ordained and written on the Heavenly Tablets. In this case, the later law was Leviticus 18:21, “You shall not give any of your offspring to be passed to [the pagan god] Molech.” Molech was apparently a Canaanite deity associated with child sacrifce (see further Leviticus 20:2-5; 2 Kings 23:10, Jeremiah 32:35), and to “pass over” probably meant to “pass through fire,” as in Deuteronomy 18:10. But in later times, this verse acquired a new meaning: “And do not give of your seed for sexual relations with a daughter of the nations to pass over to idolatry” (Mishnah Megillah 4:9, Targum Pseudo-Jonathan to Leviticus 18:21; compare Targum Neofiti and b. Megillah 25a) ..."
Kugel, James L. A Walk through Jubilees: Studies in the Book of Jubilees and the World of Its Creation (p. 145) Brill, 2012