Kiddushin 60 - Betrothal with Delayed Payment

A man said to a woman: "Become betrothed to me after thirty days," and someone betrothed her in the interim. When the thirtieth day arrives, the second betrothal remains effective and thus prevents the first one from going into effect.

If one says to a woman, “You are betrothed to me on condition that I will give you two hundred silver coins (about $10,000) – she is betrothed to him, provided that he pays. When he pays, she is betrothed to him retroactively from the first day. Therefore, if she accepted a betrothal from someone else in the interim, it is void.

Art: The Moneylender And His Wife (detail) by Quinten Metsys