The overseer is to be above reproach, faithful to his wife, temperate, self-controlled, respectable, hospitable, able to teach. –1 Timothy 3:2 (NIV)

He must be the husband of one wife; not having given a bill of divorce to one, and then taken another, or not having many wives at once, as at that time was too common both among Jews and Gentiles, especially among the Gentiles. —MATTHEW HENRY’S COMMENTARY

He must be the husband of one wife. He should be a married man, but he should be no polygamist; and have only one wife, i.e. one at a time. It does not mean that, if he has been married, and his wife die, he should never marry another. Some have most foolishly spiritualized this, and say, that by one wife the Church is intended! This silly quibbling needs no refutation. The apostle’s meaning appears to be this: that he should not be a man who has divorced his wife and married another; nor one that has two wives at a time. It does not appear to have been any part of the apostle’s design to prohibit second marriages, of which some have made such a serious business. But it is natural for some men to tithe mint and cummin in religion, while they neglect the weightier matters of the law. —ADAM CLARKE’S COMMENTARY