All petitions, reports, and applications for orders in probate must be in writing, verified, acknowledged or certified, and self-explanatory. If the petition, report, or application is certified, substantially the following language shall be used: I certify under penalty of perjury and pursuant to the laws of the state of Iowa that the preceding is true and correct. [C97, §3421; C24, 27, 31, 35, 39, § 12072; C46, 50, 54, 58, 62, §638.35; C66, 71, 73, 75, 77, 79, 81, §633.35 ] 89 Acts, ch 35, §1 Referred to in §450.58