Okla. Stat. tit. 58, § 58-178: Bond waived by will

When it is expressly provided in the will that no bond shall be

required of the executor, letters testamentary may issue and sales

of real estate be made and confirmed without any bond, unless the

court, for good cause, require one to be executed; but the executor

may, at any time afterward, if it appears from any cause necessary

or proper, be required to file a bond as in other cases.