Reference for Bava Batra 112:1

משלשין ביניהם

EACH SET PAYS THE CLAIMANT A THIRD. IF THREE BROTHERS TESTIFY [ONE TO EACH YEAR] EACH ALONG WITH THE SAME SECOND WITNESS, THEN THREE TESTIMONIES [OF TWO WITNESSES EACH] ARE OFFERED<span class="x" onmousemove="('comment',' If two or three brothers testify to the same thing they are only counted as one witness, but here, as they testify to separate years, they are reckoned as separate witnesses, and each one forms a pair with the other witness. ');">¹</span>

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