The example of Ruth and Boaz is a transparency to be laid on the picture painted by Abraham's record. We learn of incarnation and kingship of the Messiah through Abraham's call. this This is a foundational layer. The story of Ruth builds on that with the imagery of the Redeemer Kinsman, which was not hinted at until Abraham rescues Lot. Some of the lines in Ruth's transparency, overlay that of Abraham and that of Lot.