Hosea 3:2 - Albert Barnes' Notes on the Bible

So I bought her to me for fifteen pieces of silver - The fifteen shekels were half the price of a common slave Exodus 21:32, and so may denote her worthlessness. The homer and half-homer of barley, or forty-five bushels, are nearly the allowance of food for a slave among the Romans, four bushels a month. Barley was the offering of one accused of adultery, and, being the food of animals, betokens that she was “like horse and mule which have no understanding.” The Jews gave dowries for their wives; but she was the prophet’s wife already. It was then perhaps an allowance, whereby he bought her back from her evil freedom, not to live as his wife, but to be honestly maintained, until it should be fit, completely to restore her.