וְאִ֡ם שָׁכֹב֩ יִשְׁכַּ֨ב אִ֜ישׁ אֹתָ֗הּ וּתְהִ֤י נִדָּתָהּ֙ עָלָ֔יו וְטָמֵ֖א שִׁבְעַ֣ת יָמִ֑ים וְכָל־הַמִּשְׁכָּ֛ב אֲשֶׁר־יִשְׁכַּ֥ב עָלָ֖יו יִטְמָֽא׃ (פ)
E se un uomo si trova con lei e la sua impurità è su di lui, sarà impuro per sette giorni; e ogni letto su cui si trova sarà impuro. .
Reshit Chokhmah
Also regarding the punishment of one who has relations with a Gentile and a Niddah it says in the Zohar in Shemot: 24. There are three kinds of people who reject the Shechinah away from the world and prevent the dwelling of the Holy One, Blessed be He, from inhabiting this world, and then people cry out IN PRAYER but their voices are not heard. They are: 1) One who lies with a menstruating woman, for there is no stronger impurity in the world like the impurity of the menstruation. The impurity of the menstruating woman is more severe than all the impurities of the world. He WHO DOES SO becomes impure and all who are close to him become impure with him. Wherever they go, the Shechinah is repelled by them. 25. And in addition, he brings bad sicknesses upon himself and on the children that he will beget. As soon as a person comes near to a menstruating woman, that impurity leaps onto him and remains STUCK in all his limbs. The children that he begets at that moment draw on the Spirit of Impurity. And all his days he will be in impurity, because the edifice and foundation of the baby is greater and stronger than all the impurities of the world. And as soon as a man comes near to a menstruating woman, her impurity leaps on him, as is written: “And her menstrual flow be upon him” (Vayikra 15:24).