Bava Batra

MISHNAH. A PLAIN DEED  [MUST BEAR THE SIGNATURES OF] THE WITNESSES ON ITS INSIDE; A FOLDED ONE  [MUST BEAR THE SIGNATURES OF] THE WITNESSES ON THE REVERSE.  A PLAIN [ONE] THAT BEARS THE SIGNATURES OF THE WITNESSES ON THE REVERSE  [AND] A FOLDED [ONE] THAT BEARS THE SIGNATURES OF ITS WITNESSES ON THE INSIDE ARE BOTH INVALID.  R. HANINA B. GAMALIEL SAID: A FOLDED [DEED] THAT BEARS THE SIGNATURES OF THE WITNESSES ON ITS INSIDE IS VALID, BECAUSE IT CAN BE TURNED INTO A PLAIN [ONE].  R. SIMEON B. GAMALIEL SAID: ALL DEPENDS ON  THE USAGE OF THE COUNTRY. A PLAIN DEED REQUIRES TWO WITNESSES  AND A FOLDED [ONE] THREE.  A PLAIN [DEED] THAT BEARS THE SIGNATURE OF ONE WITNESS [ONLY]. AND A FOLDED [ONE] THAT BEARS THE SIGNATURES OF TWO WITNESSES [ONLY] ARE BOTH INVALID. GEMARA. Whence these words?  — R. Hanina said: For Scripture says, Men shall buy fields for money and subscribe the deeds, and seal them, and procure the evidence of witnesses.  Men shall buy fields for money and subscribe the deeds,