Okla. Stat. tit. 58, § 243
All creditors having claims against the decedent shall present their claims, as provided in Sections 333 and 334 of this title, by the presentment date stated in the notice to creditors or combined notice or the same will be forever barred.
Laws 1961, HB 565, p. 442, § 3; Amended by Laws 1988, HB 1248, c. 228, § 3, emerg. eff. June 22, 1988.