The revision petitioners are the defendants 3 to 5 in O.S.No.10 of 2007 on the file of the Court of the Additional District Judge, Hindupur. The 1st respondent herein is the plaintiff, who filed the suit for specific performance of contract directing the defendants to receive the balance sale consideration and execute the registered sale deed dated 19.01.2007 and deliver possession of the plaint schedule property. The defendants filed written statement contesting the suit claim. During the course of the evidence, the plaintiff filed his affidavit in chief examination and while it was coming up for his cross objection, an objection was raised on behalf of the defendants 1 to 5 as to the admissibility of the agreement of sale dated 19.01.2007, on the ground that it was insufficiently stamped. The said objection was overruled by the Court below by order dated 17.08.2009 and aggrieved by the same, the present revision petition is filed by the defendants 3 to 5.