Genesis 30:9

“When Leah saw that she had left bearing, etc.] For a little while, for she afterwards bore again, and observing also what her sister had done; she took Zilpah her maid, and gave her Jacob to wife: in this she was less excusable than Rachel, since she had four children of her own, and therefore might have been content without desiring others by her maid; nor had she long left off bearing, and therefore had no reason to give up hope of having any more.”

“30:9 When Leah saw that she had stopped bearing children, she countered Rachel’s effort by giving her servant . . . to Jacob as a wife even though she already had four sons.”