"....She appointed Ruth to continue her attendance in the fields of Boaz: "Let them not meet thee in any other field, for that will be construed a contempt of his courtesy." Our blessed Saviour is our Goel [Kinsman Redeemer]; it is he that has a right to redeem. If we expect to receive benefit by him, let us closely adhere to him, and his fields, and his family; let us not go to the world and its fields for that which is to be had with him only, and which he has encouraged us to expect from him.
Has the Lord dealt bountifully with us? Let us not be found in any other field, nor seek for happiness and satisfaction in the creature.
Tradesmen take it ill if those that are in their books go to another shop. We lose divine favours if we slight them.
Matthew Henry on Ruth 3