Genesis 31:41 - Jacob's Indignation With Laban

Thus have I been twenty years in thy house; I served thee fourteen years for thy two daughters, and six years for thy cattle: and thou hast changed my wages ten times.

I served thee fourteen years for thy two daughters - Jacob had agreed to serve seven years for Rachel but Laban deceived him into having to serve fourteen years; for after serving the seven years, Laban asserted that Jacob must first marry Leah because it was their custom that the older daughter marry fist (Genesis 29:26-27 NIV).