Genesis 30:4 nasb — So she gave him her maid Bilhah as a wife, and Jacob went in to her.

Now when Rachel saw that she bore Jacob no children, she became jealous of her sister; and she said to Jacob, "Give me children, or else I die."

Then Jacob's anger burned against Rachel, and he said, "Am I in the place of God, who has withheld from you the fruit of the womb?"

She said, "Here is my maid Bilhah, go in to her that she may bear on my knees, that through her I too may have children."

Bilhah conceived and bore Jacob a son.

Then Rachel said, "God has vindicated me, and has indeed heard my voice and has given me a son." Therefore she named him Dan.

Rachel's maid Bilhah conceived again and bore Jacob a second son.