Before the senate shall proceed to try the impeachment, the president of the senate, and every senator present, shall take the following oath or affirmation: "I do solemnly swear (or affirm), that I will faithfully and impartially try the impeachment against A.B., and do justice according to the law and the evidence."

G.S. 1868, ch. 49, § 9; October 31; R.S. 1923, 37-109.