Iowa Code § 60.3: Oath.

Each member of the court, before entering upon the discharge of the member’s duties, shall take an oath before the secretary of state, or some officer qualified to administer oaths, that the member will support the Constitution of the United States and that of the state of Iowa, and that, without fear, favor, affection, or hope of reward, the member will, to the best of the member’s knowledge and ability, administer justice according to law and the facts in the case.