Genesis 30:3
"And she said, Behold my maid Bilhah, go in unto her; and she shall bear upon my knees, that I may also have children by her."
Cross References (ranked by relevance)
And Joseph saw Ephraim’s children of the third generation: the children also of Machir the son of Manasseh were brought up upon Joseph’s knees.
Why did the knees prevent me? or why the breasts that I should suck?
And all the people that were in the gate, and the elders, said, We are witnesses. The LORD make the woman that is come into thine house like Rachel and like Leah, which two did build the house of Israel: and do thou worthily in Ephratah, and be famous in Bethlehem:
When Leah saw that she had left bearing, she took Zilpah her maid, and gave her Jacob to wife.