Kiddushin 50 - Betrothal by a Liar

If a man says to a woman, "Become betrothed to me on condition that I am a Kohen," but he is found to be a Levi or the reverse - even if the woman later says, "In my heart, I intended to become betrothed to him nevertheless," - she is not betrothed. Unexpressed intentions are not recognized in Jewish law.

If one betroths a woman and her sister simultaneously, neither is betrothed.

There were five women, two of whom were sisters, and a man collected a basket of their figs and said, "You are all betrothed to me with this basket" - the sisters were not betrothed.

Art: Three Sisters - A Study in June Sunlight by Edmund Charles Tarbell