A spoken statement swearing to perform certain duties, represent the office ethically or other promises made before one or more witnesses. For example the president of the US swears to a standard oath that all other presidents have sworn to.

Oath taken by members-elect of the legislature prior to being seated and embarking upon official duties.

An oath that is taken by Members-elect prior to being seated and embarking upon official duties.

a sworn statement/ oath a person takes before officially assuming the office

An oath or vow taken by a public official prior to taking up his or her official duties.

Oath or vow taken by public officials prior to being seated and taking up their official duties.

An attestation that one will tell the truth, or a promise to fulfill a pledge, often calling upon God as a witness. The best known oath is probably the witness’ pledge “to tell the truth, the whole truth, and nothing but the truth” during a legal proceeding. In another context, a public official usually takes an “oath of office” before assuming her position, in which she declares that she will faithfully perform her duties.

An oath of office is an oath or affirmation a person takes before officially assuming an office. Most of the time an oath of office is taken before assuming an office for the state or for some religion. It is usually administered at an inauguration, coronation, enthronement, or other ceremony of taking up office.