Every officer of the Legislature shall, before he enters upon his duties, take and subscribe the following oath or affirmation: "I do solemnly promise and swear (or affirm) that I will faithfully, impartially and justly perform all the duties of the office of ................, to the best of my ability and understanding; that I will carefully preserve all records, papers, writings, or property entrusted to me for safekeeping by virtue of my office, and make such disposition of the same as may be required by law."