Genesis 30:1-3

1When Rachel saw that she conceived no children for Jacob, she envied her sister, and said to Jacob, “Give me children, or else I will die.”

2Then Jacob became furious with Rachel, and he said, “Am I in the place of God, who has denied you children?”

3She said, “Here, take my maid Bilhah and go in to her; and [when the baby comes] she shall deliver it [while sitting] on my knees, so that by her I may also have children [to count as my own].”