Shebwin, J.
1 A witness called by the state, who gave damaging testimony against the defendant, was not sworn before testifying. Nor was the omission discovered by the defendant until the verdict had been returned. Erom the very inception of judicial procedure down to the present time some form of oath, or some recognition of accountability for falsely testifying, has been required by lawmakers and by courts. In 1 Greenleaf, Evidence, section 328, it is said: “ But here it is proper to observe that one of the main provsions of the law for securing the purity and truth of oral evidence is that it be delivered under the sanction of an oath,” “The force and utility of this sanction were familiar to the Komans from the ealiest times.” 1 Starkie, Evidence, 22. The principle that all persons capable of understanding the nature and obligation of an oath, and only such, are competent witnesses, is generally recognized in the various statutory provisions on this subject'. And our own statute so declares in substance, section 4601. Bouvier defines “witness” as one who “testfies under oath to something which he knows at first hand.” 2 Bouvier’s Law Dictionary, 821. “All oral evidence given in any proceeding must' be given upon oath, but if any person called as a witness refuses or is unwilling to be sworn, from alleged conscientious motives, the judge before whom the evidence *270is taken may, upon being satisfied of the sincerity of snob objection, permit sucli person to affirm. Stephen’s Digest of Evidence, 214. It is the recognition of the principle under consideration which excludes the t estimony of infants of such tender age as' to be incapable of feeling or understanding the obligation of an oath (Kilburn v. Mullen, 22 Iowa, 498" court="Iowa" date_filed="1867-07-03" href="https://app.midpage.ai/document/kilburn-v-mullen-7093785?utm_source=webapp" opinion_id="7093785">22 Iowa, 498), and which admits declarations made under the solemn sense of approaching dissolution. As early as 1779 it was held, by the 12 English judges, that no testimony could be legally received in criminal cases except upon oath. Rex v. Braiser, 1 Leach, 199. See note in State v. Michael, 37; W. Va. 565 (19 L. R. A. 605 s. c. 16 S.E. 803" court="W. Va." date_filed="1893-01-28" href="https://app.midpage.ai/document/state-v-michael-6594728?utm_source=webapp" opinion_id="6594728">16 S. E. Rep. 803), The rule has been followed in the United States in the following and other cases: State v. Doherty, 2 Overt. 80; State v. Tom, 8 Or. 178; People v. Frindel, 58 Hun, 482" court="N.Y. Sup. Ct." date_filed="1890-12-29" href="https://app.midpage.ai/document/people-v-frindel-5499832?utm_source=webapp" opinion_id="5499832">58 Hun, 482 (12 N. Y. Supp. 498); Hawks v. Baker, 6 Me. 72" court="Me." date_filed="1829-05-15" href="https://app.midpage.ai/document/hawks-v-baker-4926013?utm_source=webapp" opinion_id="4926013">6 Me. 72 (19 Am. Dec. 191) ; McKinney v. People, 7 Ill. 540" court="Ill." date_filed="1845-12-15" href="https://app.midpage.ai/document/mckinney-v-people-6946773?utm_source=webapp" opinion_id="6946773">7 Ill. 540 (43 Am. Dec. 65); 29 Am. & Eng. Enc. Law, 764. And where, through an oversight as in this case, a witness testified without being sworn, and the fact was not discovered until after the trial, the verdict was set aside. Hawks v. Baker, supra. But objections must be made as soon as the error is discovered. Slauter v. Whitelock, 12 Ind. 338" court="Ind." date_filed="1859-06-01" href="https://app.midpage.ai/document/slauter-v-whitelock-7034161?utm_source=webapp" opinion_id="7034161">12 Ind. 338; Cady v. Norton, 14 Pick. 236. The constitution of this state guaranties to every man accused of crime the right to be confronted with the witnesses against him, and this would be but a barren right, and afford the defendant no protection, if such witnesses may testify without being sworn, or without in any way being subject to the penalties for perjury. The motion for a new trial should have been granted on this ground of the motion. There was no error in permitting evidence as to the defendant’s acts in another place. It tended to show her disposition, and was for that reason competent. State v. Briggs, 68 Iowa, 416" court="Iowa" date_filed="1886-03-19" href="https://app.midpage.ai/document/state-v-briggs-7101989?utm_source=webapp" opinion_id="7101989">68 Iowa, 416. There was no error in overruling the motion for a new trial on the ground-*271of insufficiency o± evidence. Bor the error pointed out, the case is reversed, and remanded for a new trial. — Reversed.