A person shall be put to death only by the testimony of two or more witnesses; he can not be put to death based on the testimony of a single witness.
If I know that two witnesses are sufficient, then would I not assume that three witnesses would certainly be sufficient?
However, the Torah is teaching us that the court must thoroughly investigate all witnesses who may have observed an event, no matter how many witnesses there may be.
From here the Talmud learns that no matter how many witnesses come forward to give testimony, they are treated as a single group.
This means that if even one of them is disqualified, then the entire group is disqualified.
So too, if even one of them is invalidated by a different set of witnesses (who testify that one of the witnesses could not have observed the event because he was at a different place on that day and at that time) then the entire group is invalidated.
(Ramban, Makkot 5b)
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