1 Timothy 2:5; 1 Timothy 3:2; 1 Timothy 3:12; 1 Timothy 5:9

5 For there is one God, and one mediator also between God and men, the man Christ Jesus,
2 An overseer, then, must be above reproach, the husband of one wife, temperate, prudent, respectable, hospitable, able to teach,
12 Deacons must be husbands of only one wife, and good managers of their children and their own households.
9 A widow is to be put on the list only if she is not less than sixty years old, having been the wife of one man,