Malachi 2:14-17
Yet ye say, Wherefore? Because the LORD hath been witness between thee and the wife of thy youth, against whom thou hast dealt treacherously: yet is she thy companion, and the wife of thy covenant.
And did not he make one? Yet had he the residue of the spirit. And wherefore one? That he might seek a godly seed. Therefore take heed to your spirit, and let none deal treacherously against the wife of his youth.

Matthew 19:3-12
The Pharisees also came unto him, tempting him, and saying unto him, Is it lawful for a man to put away his wife for every cause?
And he answered and said unto them, Have ye not read, that he which made them at the beginning made them male and female,
And said, For this cause shall a man leave father and mother, and shall cleave to his wife: and they twain shall be one flesh?
Wherefore they are no more twain, but one flesh. What therefore God hath joined together, let not man put asunder.

They say unto him, Why did Moses then command to give a writing of divorcement, and to put her away?
He saith unto them, Moses because of the hardness of your hearts suffered you to put away your wives: but from the beginning it was not so.
And I say unto you, Whosoever shall put away his wife, except it be for fornication, and shall marry another, committeth adultery: and whoso marrieth her which is put away doth commit adultery.

His disciples say unto him, If the case of the man be so with his wife, it is not good to marry.
But he said unto them, All men cannot receive this saying, save they to whom it is given.
For there are some eunuchs, which were so born from their mother's womb: and there are some eunuchs, which were made eunuchs of men: and there be eunuchs, which have made themselves eunuchs for the kingdom of heaven's sake. He that is able to receive it, let him receive it.

Romans 7:1-3
Know ye not, brethren, (for I speak to them that know the law,) how that the law hath dominion over a man as long as he liveth?
For the woman which hath an husband is bound by the law to her husband so long as he liveth; but if the husband be dead, she is loosed from the law of her husband.
So then if, while her husband liveth, she be married to another man, she shall be called an adulteress: but if her husband be dead, she is free from that law; so that she is no adulteress, though she be married to another man.

I Timothy 3:2 
A bishop then must be blameless, the husband of one wife, vigilant, sober, of good behaviour, given to hospitality, apt to teach;

I Timothy 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.