Jamieson, Fausset and Brown on Ruth 4:3

3. Naomi ... selleth a parcel of land--that is, entertains the idea of selling. In her circumstances she was at liberty to part with it (Le 25:25). Both Naomi and Ruth had an interest in the land during their lives; but Naomi alone was mentioned, not only because she directed all the negotiations, but because the introduction of Ruth's name would awaken a suspicion of the necessity of marrying her, before the first proposition was answered.