Okla. Stat. tit. 12, § 922

The affidavit provided for in the preceding section shall be in the form following, and attached to the petition, viz.: State of Oklahoma, ____________ County, ____________, in the district court of said county: I do solemnly swear that the cause of action set forth in the petition hereto prefixed is just, and I (or we) do further swear that by reason of my (or our) poverty, I am unable to give security for costs.