Ala. Code § 45-28A-42.04

Every person who shall be appointed as a member of such civil service board according to this subpart, shall within 15 days thereafter qualify by making oath that he or she is eligible for the office and shall execute the duties of the same according to his or her best knowledge and ability. Such oath shall be administered by any person authorized to administer oaths or by any member of the board of commissioners of such city, and a copy thereof filed with the city clerk.