§ 246. Oath to members of the court. At the time and place appointed,
and before the court proceeds to act upon the impeachment, the clerk
must administer to the presiding judge, and the presiding judge to each
of the members of the court then present, an oath or affirmation truly
and impartially to try and determine the impeachment; and no member of
the court can act or vote upon the impeachment, or any question arising
thereon, without having taken this oath or affirmation.