וּבְנֵ֨י יַעֲקֹ֜ב בָּ֤אוּ מִן־הַשָּׂדֶה֙ כְּשָׁמְעָ֔ם וַיִּֽתְעַצְּבוּ֙ הָֽאֲנָשִׁ֔ים וַיִּ֥חַר לָהֶ֖ם מְאֹ֑ד כִּֽי־נְבָלָ֞ה עָשָׂ֣ה בְיִשְׂרָאֵ֗ל לִשְׁכַּב֙ אֶת־בַּת־יַעֲקֹ֔ב וְכֵ֖ן לֹ֥א יֵעָשֶֽׂה׃
And the sons of Yaakov came from the field when they heard; and the men were grieved and they were very angry, because he had done a disgraceful thing in Yisrael by lying with the daughter of Yaakov, and such a thing ought not to be done.
Torah Temimah points to Sanhedrin 74a (and related discussions of forced relations).
וכן לא יעשה — מלמד שדבר זה אסור לבני נח.
“And such a thing ought not to be done” — this teaches that this matter is forbidden even to the descendants of Noach.
The verse is cited in discussions of universal prohibitions.
Derash on the universality of the prohibition (Bavli).
The act is described as something that must not be done, indicating a prohibition that extends beyond Yisrael.