I believe the Bible teaches that a Christian is to only have one wife. All following references indicate wife as singular not plural.
1 Tim 3:2 A bishop then must be blameless, the husband of one wife, vigilant, sober, of good behaviour, given to hospitality, apt to teach;
1 Tim 3:12 Let the deacons be the husbands of one wife, ruling their children and their own houses well.
Titus 1:6 If any be blameless, the husband of one wife, having faithful children not accused of riot or unruly.
1 Pet 3:7 Likewise, ye husbands, dwell with them according to knowledge, giving honour unto the wife, as unto the weaker vessel, and as being heirs together of the grace of life; that your prayers be not hindered.
Eph 5:28 So ought men to love their wives as their own bodies. He that loveth his wife loveth himself.
Eph 5:31 For this cause shall a man leave his father and mother, and shall be joined unto his wife, and they two shall be one flesh.
(KJV)