Gittin 58 - Buying a field in earnest

Three boxes of head tefillin, measuring together about 1,000 liters, were recovered from the victims of Bethar.

If one acquires a plot of land from an oppressor and then acquires it from the owner (by paying him required ΒΌ of the amount), it is not valid. He has to acquire it from the owner, and then from the oppressor. The owner's sale needs to be recorded in a document with title insurance. Then we assume that the owner was sincere.

Similarly, a buyer of a field designated for ketubah should acquire consent from the wife and the field from the husband.