פּירוש אויף בראשית 31:50

בנתי....בנתי The word is written twice, referring once to Leah and Rachel and the second time to the handmaids, because Bilhah and Zilpah were also his daughters from a concubine (Genesis Rabbah 74:13).

אם תענה את בנותי, “if you were to maltreat my daughters;” Lavan refers to the possibility of Yaakov forcing marital intercourse on his daughters against their will. If he were to argue that in the event of their refusing him he would marry additional wives, he would consider this as if his daughters had been denied their legitimate entitlement to their marital rights.

ראה אלוקים עד, look that G’d will punish you if you do not treat my daughters properly, seeing He is a witness The whole line may be understood as analogous to Leviticus 5,21, ומעלה מעל בה', where the trespass against G’d is considered as something that only G’d is aware of, there being no human witnesses at hand to testify against the sinner. G’d is always the third party when two people have a disagreement, seeing He knows the true facts of the situation.

אם תענה את בנתי IF THOU SHALT AFFLICT MY DAUGHTERS by refusing them thy companionship (Yoma 77b).