Mich. Comp. Laws § 168.363

Sec. 363. All township officers shall, before entering upon the duties of their offices, take and subscribe the oath as provided in section 1 of article 11 of the state constitution before the township clerk or other officer authorized to administer oaths, and file the same with the township clerk who shall record the same; and such oath shall be administered without reward and certified by the officer before whom the same was taken, with the date of taking the same.