I just finished listening to Rabbi Zecharia Wallerstein's shiur on Parashas Chaye Sara, relating Sarah's modesty to Moshiach. It has a similar message to Rabbi Eli Mansour's shiur, linking Sarah's modesty of being in the tent to Lot being saved, to the Moabite women's modesty, to Ruth and to King David, however, the rendition and the interpretation is quite different.
Being modest does not only mean to dress modestly, it also means to behave modestly and that includes not talking to men who's not your husband. Sarah was a gilgul (reincarnation) of Chava, whose first fault was not eating from the tree of knowledge of good and evil, but to strike a conversation with the snake. She could have been wiser to refer the snake to her husband, but she didn't and she ended up getting emotionally fooled by the snake which led to death in the world.
If you read Rabbi Eliyahu Falk's book on modesty, he covers modesty in speech and behavior as well. Married women, for instance, should be addressed only by Mrs. So and So.. and not by their first names. In Israel, it is extremely common, even among some Charedi circles, to refer to everyone by their first names. I was a bit shocked as a new olim, but I became more assertive and started addressing myself as Mrs. .... When you call a cab, they ask you for your name, and it's easy to just say ...., but one should be cautious, to be more formal.
If Sarah was a gilgul of Chava, then how about Avraham? Avraham was a gilgul of Adam. They both fixed the sin of talking to the snake and started the seed of Moshiach, by Avraham answering the angels when addressed, "Where is Sarah, your wife?" with "Here, inside the tent!" That Sarah was modest, she was not supposed to be out there serving the men. Avraham's precedent in setting up the halacha of modesty right there and then, led to our Sages later on to pasken the halacha that the Moabite women, too, were modest because they didn't go out serving food to the Jews in the desert, and they were not at fault because of the halacha of modesty, and therefore, Moabite women were allowed to be married to Jewish men. Thus, Ruth's conversion was kosher, and David HaMelech was halachically Jewish.
Listen to the shiur yourself from Rabbi Wallerstein.
