Okla. Stat. tit. 58, § 58-482: Terms of the sale of land contract

The sale must be made subject to all payments that may hereafter

become due on such contracts, and if there are any such the sale

must not be confirmed by the district court until the purchasers

execute a bond to the executor or administrator, for the benefit and

indemnity of himself and of the person entitled to the interest of

the decedent in the lands so contracted for, in double the whole

amount of payments thereafter to become due on such contract, with

such sureties as the judge of the district court shall approve.