Before beginning the duties of the office of coroner, a coroner shall take the oath required of all civil officers and shall take the following oath:

"I swear that I will well and truly serve the State of Georgia in said office and faithfully and truly execute all writs and precepts to me directed or which I may lawfully execute, when placed in my charge, and return the same according to the best of my knowledge, skill, and judgment; that I will in no case knowingly use or exercise my office illegally, corruptly, or unjustly and that I will not, under any pretense, take, accept, or enjoy any fee or reward pertaining to my office other than such as are allowed by law; but that I will, in all things touching the duties of my office, demean myself honestly, fairly, and impartially according to the best of my ability, so help me God."