Okla. Stat. tit. 84, § 84-109: Effect of sale of devised property

An agreement made by a testator, for the sale or transfer of

property disposed of by will previously made, does not revoke such

disposal; but the property passes by the will, subject to the same

remedies on the testator's agreement, for a specific performance or

otherwise, against the devisees or legatees, as might be had against

the testator's successors, if the same had passed by succession.