Okla. Stat. tit. 68 § 1907
No mortgage of real property shall be recorded by any county clerk unless there shall be paid the tax imposed by and as in this article provided. No mortgage of real property which is subject to the taxes levied by this article shall be released, discharged of record or received in evidence in any action or proceeding, nor shall any agreement extending any such mortgage be recorded unless the taxes levied thereon by this article shall have been paid as provided in this article. No judgment or final order in any action or proceeding shall be made for the foreclosure or enforcement of any mortgage which is subject to the taxes levied by this article or of any debt or obligation secured by or which secures any such mortgage unless the taxes levied by this article shall have been paid as provided in this article.
Okla. Stat. tit. 68, § 1907