Mich. Comp. Laws § 551.9: Solemnization of marriage; form; declaration by parties; witnesses.

Sec. 9.

In the solemnization of marriage, no particular form shall be required, except that the parties shall solemnly declare, in the presence of the person solemnizing the marriage and the attending witnesses, that they take each other as husband and wife; and in every case, there shall be at least 2 witnesses, besides the person solemnizing the marriage, present at the ceremony.