The book of Ruth is a short narrative set in the time of the Judges and sits in the historical books of the Old Testament; it has 4 chapters in the King James Version.
Ruth is traditionally attributed to Samuel. Ruth tells how Naomi, an Israelite widow, returns from Moab with her Moabite daughter-in-law Ruth, who marries Boaz of Bethlehem and becomes an ancestor of King David. A well-known passage from this book is Ruth 1:16. Read the full book at Ruth.