Okla. Stat. tit. 58, § 58-521: Promise to pay debts of decedent

No executor or administrator is chargeable upon any special

promise to answer damages or to pay the debts of the testator or

intestate out of his own estate, unless the agreement for that

purpose, or some memorandum or note thereof, is in writing and

signed by such executor or administrator, or by some other person by

him thereunto specially authorized.