Okla. Stat. tit. 84, § 84-110: Encumbrance not a revocation

A charge or encumbrance upon any estate, for the purpose of

securing the payment of money or the performance of any covenant or

agreement, is not a revocation of any will relating to the same

estate which was previously executed, but the devise and legacies

therein contained must pass subject to such charge or encumbrance.