521.620. If the petition denying the cause of action be notverified by oath, or if the petition allege a setoff or othercollateral avoidance of the original cause of action, thepetitioner shall be required to prove his allegations, and, onhis failure to do so, his petition shall be dismissed, and theoriginal judgment shall stand absolute; and if any part thereofremain unpaid, a general judgment shall be rendered against himfor the balance remaining unpaid.
(RSMo 1939 § 1500)Prior revisions: 1929 § 1336; 1919 § 1787; 1909 § 2356