In Gen 31:41, Jacob confirms he served twenty years for Laban's daughters and flocks — backing up Rachel and Leah's claim that their father 'sold' them and devoured the profit.

In Gen 29:15-20, Jacob agreed to work seven years for Rachel — the 'sale' price. Rachel and Leah's bitterness here echoes that transactional arrangement their father made.

In Gen 29:27-30, Laban required seven more years for Rachel and gave her to Jacob. Rachel was literally traded for fourteen years of labor — exactly what she and Leah protest here.

In Gen 30:26, Jacob himself tells Laban he served for his wives and children — acknowledging the same arrangement Rachel and Leah now call being 'sold' by their father.

Genesis 29:30 records Jacob serving seven more years for Rachel — the very 'money' Laban 'sold' his daughters for and consumed. 31:15 references this history directly.