Bava Batra 31 - Presumption, Amended Pleadings
Two litigants were disputing ownership of a property. One said, "It was the land of my forefathers," and produced witnesses. The other one produced witnesses that he used the land for three years needed to establish presumptive ownership (chazakah.)
Rabbah said, "Why should he lie?" The current occupant could have kept the land, claiming that he bought it, so we should believe him when he says that he inherited it. But Abaye said, "Why should he lie?" can't be used to contradict witnesses.
The current occupant then changed his claim, saying, "Yes, the land indeed belonged to your forefathers, but I bought it from them, and I feel as secure as if it were my forefathers" - this claim was accepted.
The general rule is that one cannot enter a claim that contradicts his previous claim entirely, but he can add information or amend the previous claim by reinterpreting it.
Art: A Field of Barley by John William North
Don't understand a point? Ask MosesAI about it.