Kabbalah zu Bereschit 24:24

Why are we told, "The daughter of Betu'el the Arammian of Paddan-aram, the sister to Laban the Arammian?" Why should we care to know all this? It had already been written, "And Betu'el sired Rivkah" (Gen. 22:23), and now she is described as "of Paddan-aram, the sister to Laban the Arammian." This is to teach us that she was born among the misled, she did not follow their ways. Therefore it is written that she was the daughter of Betu'el, of Paddan-aram, and the sister of Laban, who were all wicked and evil doers; but she did good deeds and did not behave as they did.