Commentary for Genesis 34:7

וכן לא יעשה AND THUS IT OUGHT NOT TO BE DONE — viz., to do violence to a maiden, for even the heathens have trained themselves (literally, have fenced themselves round) against unchastity as a consequence of the Flood which had come upon the world as a punishment for this sin (Genesis Rabbah 80:6).

AND THUS IT OUGHT NOT TO BE DONE. I.e., to do violence to maidens, for the nations “had fenced themselves round” against unchastity as a result of the Flood. This is Rashi’s language. But I do not know this, for the Canaanites were immersed in unchastity with women, beasts and males, as it is written, For all these abominations have the men of the land done, that were before you,¹²⁸Leviticus 18:27. and they did not begin such practices in that generation [but rather it was their traditional behavior], and even in the days of Abraham and Isaac, the patriarchs feared lest they kill them in order to take their wives. Instead, the expression, and thus it ought not to be done, refers back to the word beyisrael (in Israel): because he had wrought a vile deed in Israel… and thus it ought not to be done among them. This is why Scripture said in Israel for it was not a base deed among the Canaanites. And Onkelos translated: “It is not proper that it be done,” meaning that it is forbidden, and that is why it was a base deed in Israel.

ובני יעקב באו מן השדה, during this time Chamor had come from the town to speak to Yaakov, finding the brothers present.