Ruth

a friend, a Moabitess, the wife of Mahlon, whose father,
Elimelech, had settled in the land of Moab. On the death of
Elimelech and Mahlon, Naomi came with Ruth, her daughter-in-law,
who refused to leave her, to Bethlehem, the old home from which
Elimelech had migrated. There she had a rich relative, Boaz, to
whom Ruth was eventually married. She became the mother of Obed,
the grandfather of David. Thus Ruth, a Gentile, is among the
maternal progenitors of our Lord (Matt. 1:5). The story of "the
gleaner Ruth illustrates the friendly relations between the good
Boaz and his reapers, the Jewish land system, the method of
transferring property from one person to another, the working of
the Mosaic law for the relief of distressed and ruined families;
but, above all, handing down the unselfishness, the brave love,
the unshaken trustfulness of her who, though not of the chosen
race, was, like the Canaanitess Tamar (Gen. 38:29; Matt. 1:3)
and the Canaanitess Rahab (Matt. 1:5), privileged to become the
ancestress of David, and so of 'great David's greater Son'"
(Ruth 4:18-22).