Section 17 · The affidavit accompanying a petition for review made upon the ground of the discovery of new and important matter of evidence, within the meaning of Order XLVII, Rule 1 of the Code of Civil Procedure shall state in clear terms what such new and important matter of evidence is, the effect or purport thereof and that the same, after the exercise of due diligence, was not within the knowledge of the petitioner, or could not be produced by him at the time when the decree was passed, the order was made or the judgement was delivered. The documents, if any, relied upon shall be annexed to the petition