Declining or neglecting to take oath

If any officer specified in section 5 declines or neglects, when any oath required to be taken by him is duly tendered, to take such oath, he shall, if he has already entered on his office, vacate it and, if he has not entered on it, be disqualified from entering on it, but no person shall be compelled in respect of the same appointment to the same office to take such oath or make such affirmation more times than one.