We continue learning about the haggadah as the Sefer Habris. The bris milah guards the sanctity of the Jewish people in areas of morality. Pharaoh, and the lustful Egyptians, tried to undermine our holiness and cause us to fail in that area. However, the merit of us holding onto the holiness and sanctity in relationships helped us merit to leave Mitzrayim. Hashem himself testifies about the integrity of the families of Bnei Yisroel, whose relationships are within the sanctity of bris.