Ruth had every reason, humanly speaking, to leave her mother in law Naomi as her sister Orpah had just done, but she would not do it. Why? It was because of more than mere social and emotional attachment, and it certainly was not for any financial gain. In fact, she faced the possibility of being a social outcast in Israel and of remaining unmarried for life, wheras she could easily find a new husband in Moab. But Ruth would not go back to the old gods and old ways of her past. She steadfastly clung to the Lord Jehovah, having been converted to Him in her heart.
And Ruth said, Intreat me not to leave thee, or to return from following after thee: for whither thou goest, I will go; and where thou lodgest, I will lodge: thy people shall be my people, and thy God my God: Ruth