1 Samuel 1:6

And the other wife did everything possible to make her unhappy, because the Lord had not let her have children;

And you may not take as wife a woman and at the same time her sister, to be in competition with her in her life-time.

He whose heart is shut against his friend has given up the fear of the Ruler of all.

He is not kind to the widow, and he has no pity for her child.

Treasury of Scripture Knowledge

And her adversary also provoked her sore, for to make her fret, because the LORD had shut up her womb.

And you may not take as wife a woman and at the same time her sister, to be in competition with her in her life-time.

He whose heart is shut against his friend has given up the fear of the Ruler of all.

For the Lord had kept all the women of the house of Abimelech from having children, because of Sarah, Abraham's wife.