וְיַעֲקֹ֣ב שָׁמַ֗ע כִּ֤י טִמֵּא֙ אֶת־דִּינָ֣ה בִתּ֔וֹ וּבָנָ֛יו הָי֥וּ אֶת־מִקְנֵ֖הוּ בַּשָּׂדֶ֑ה וְהֶחֱרִ֥שׁ יַעֲקֹ֖ב עַד־בֹּאָֽם׃
야곱이 그 딸 디나를 그가 더럽혔다 함을 들었으나 자기 아들들이 들에서 목축하므로 그들의 돌아오기까지 잠잠하였고
Sforno on Genesis
והחריש יעקב עד בואם, he refrained from starting a quarrel until his sons would have been informed of what happened so that they could be on their guard against their adversaries.
Or HaChaim on Genesis
עד בואם, until they came home. Jacob sent a message to them asking them to return home.
Radak on Genesis
ויעקב שמע כי טמא, Shechem, who had already been mentioned (hence his name does not need to be repeated here and a pronoun will do) and that as a result of what he did, Dinah had been defiled by an uncircumcised person who had been intimate with her.