Parsha Chayei Sarah - Chapter 24 - Verse 23 - 26
Rivka answers Eliezers question about"whose daughter are you?" by saying who she is by going back 4 generations to her great great grandfather Nahor (who happens to be Avraham Avinu's brother). From here we see how proud she was of her lineage, teaching us that we all should be proud of ours. For each of us have a great great grandfather who had a beard and a great great grandmother who covered her head. We all come from great stuff. And the older you are, the closer you are to Sinai. We have to remember our ancestors, who are the links in our chain, and bring us back to our great, great roots in the great mesorah of Klal Yisroel.
Raize briefly mentions something from the Netziv from his book Ha’amek Davar which details why Rivka did not have the same relationship with her husband as Sarah had with Avraham.