>>18282553It isn't just Esau. Solomon famously builds shrines to the abominations worshipped by his harem and God is not pleased at this as He is a jealous God.
However, Ruth is a Moabite and she is the great grandmother of King David as well as a progenitor of Jesus Christ. So not only are her people started from incest but she is not a true Israelite whose entire bloodline is redeemed.