Mo. Rev. Stat. § 473.237
The administrator or executor and appraisers shall annex to the inventory and appraisement an affidavit stating that it is a full inventory and description of all the property of the decedent which has come into the possession or knowledge of the executor or administrator, and of the property in the possession of the decedent at his death, as far as they know, and an appraisement of all the property subject to appraisement. The executor or administrator shall make an additional affidavit stating that he was not in debt or bound in any contract to the decedent at the time of his death, except as stated in the inventory and appraisement. The administrator or executor has power to administer the oaths for the affidavits required by this section and section 473.233.
§ 473.237, RSMo