וַתֹּ֤אמֶר רִבְקָה֙ אֶל־יִצְחָ֔ק קַ֣צְתִּי בְחַיַּ֔י מִפְּנֵ֖י בְּנ֣וֹת חֵ֑ת אִם־לֹקֵ֣חַ יַ֠עֲקֹב אִשָּׁ֨ה מִבְּנֽוֹת־חֵ֤ת כָּאֵ֙לֶּה֙ מִבְּנ֣וֹת הָאָ֔רֶץ לָ֥מָּה לִּ֖י חַיִּֽים׃
И Ревекка сказала Исааку: 'Я устал от своей жизни из-за дочерей Хета. Если Иаков возьмет жену дочерей Хета, таких как эти, из дочерей земли, что хорошего мне сделает моя жизнь?'
Rashbam
IF YA'AKOV MARRIES. Rivka said this to Yitzhak cleverly, to separate Ya'akov from Eisav, but she did not reveal to him that it was because of his [Ya'akov's] brother's hatred that she did this.
Radak
ותאמר...מפני בנות חת, the ones referred to were only those whom Esau had married. Rivkah says that if Yaakov were to marry someone similar, it would be better that she would die now. She considered Yaakov as already single for too many years so that she asked Yitzchok to order him to go to her brother Lavan, thereby saving him both from the avenging sword of his brother and from the daughters of the Canaanites one of whom might want to marry him Once in the house of Lavan, Yaakov would either marry one of Lavan’s daughters or some other woman related to Rivkah.