All persons on being admitted to the bar shall take an oath or affirmation, as promulgated by the supreme court, declaring to support the Constitutions of the United States and of the state of Iowa, and to faithfully discharge, according to the best of their ability, the duties of an attorney.
Iowa Code § 602.10110
83 Acts, ch 186, §10202(2) 2005 Acts, ch 179, §76, 89