their first faith: If Paul was concerned about a second marriage to non-Christians, this phrase might refer to their Christian faith (see 5:14). They would give up this faith by entering a marriage with a pagan (worshiper of false gods). This would probably separate them from Christ. It is also possible that Paul and the church recognized a special category of “sacred widowhood” (see 5:5; compare Acts 9:36–37). These widows entered this category by making a vow.