Ohio Rev. Code Ann. § 2117.08

When a claim is presented against the estate of a deceased person, the executor or administrator may require satisfactory written proof in support of it and also the affidavit of the claimant that the claim is justly due, that no payments have been made on the claim, and that there are no counterclaims against it to the claimant's knowledge. The affidavit shall set forth any security held for the payment of the claim and, if the claim is not due, the date of maturity. If the claim arises out of tort, or if preference in payment is claimed, the facts in connection with the alleged tort or showing the right to that preference shall be briefly set forth.