Genesis 30:4

1 Now Rachel, because she had no children, was full of envy of her sister; and she said to Jacob, If you do not give me children I will not go on living.

2 But Jacob was angry with Rachel, and said, Am I in the place of God, who has kept your body from having fruit?

3 Then she said, Here is my servant Bilhah, go in to her, so that she may have a child on my knees, and I may have a family by her.

4 So she gave him her servant Bilhah as a wife, and Jacob went in to her.

5 And Bilhah became with child, and gave birth to a son.

6 Then Rachel said, God has been my judge, and has given ear to my voice, and has given me a son; so he was named Dan.

7 And again Bilhah, Rachel's servant, was with child, and gave birth to a second son.