I Samuel 1:4-7

And whenever the time came for Elkanah to make an offering, he would give portions to Peninnah his wife and to all her sons and daughters. But to Hannah he would give a double portion, for he loved Hannah, although the LORD had closed her womb. And her rival also provoked her severely, to make her miserable, because the LORD had closed her womb. So it was, year by year, when she went up to the house of the LORD, that she provoked her; therefore she wept and did not eat.