The text from the book of Ruth in the Bible tells the story of Boaz, a wealthy landowner, marrying Ruth, a Moabite widow, after she is left with nothing following the death of her husband. Boaz's act of marrying Ruth fulfills a legal obligation called "redemption" that requires a close relative to purchase a deceased relative's land and marry their widow. This act, witnessed by the elders and the community, ultimately brings Ruth and Boaz's son, Obed, into the family line of Perez, the ancestor of King David. The text then goes on to trace the lineage of Perez, who was a son of Judah and Tamar, highlighting how Boaz and Ruth's union was a crucial event in the line of kings, ultimately leading to the birth of King David.