Why
Mateus 5:31
It has been said, Whosoever shall put away his wife, let him give her a writing of divorcement:
Deuteronômio 24:1-4
1
When a man has taken a wife, and married her, and it comes to pass that she finds no favor in his eyes, because he has found some uncleanness in her: then let him write her a bill of divorcement, and put it in her hand, and send her out of his house.
2
And when she is departed out of his house, she may go and be another man's wife.
3
And if the latter husband hates her, and writes her a bill of divorcement, and puts it in her hand, and sends her out of his house; or if the latter husband dies, who took her to be his wife;
4
Her former husband, who sent her away, may not take her again to be his wife, after she is defiled; for that is abomination before the LORD: and you shall not cause the land to sin, which the LORD your God gives you for an inheritance.
Isaías 50:1
Thus says the LORD, Where is the bill of your mother's divorcement, whom I have put away? or which of my creditors is it to whom I have sold you? Behold, for your iniquities have you sold yourselves, and for your transgressions is your mother put away.
Jeremias 3:8
And I saw, when for all the causes for which backsliding Israel committed adultery I had put her away, and given her a bill of divorce; yet her treacherous sister Judah feared not, but went and played the harlot also.
Marcos 10:4
And they said, Moses allowed a man to write a bill of divorcement, and to put her away.
and to
Mateus 1:19
Then Joseph her husband, being a just man, and not willing to make her a public example, decided to put her away privately.
Malaquias 2:16
For the LORD, the God of Israel, says that he hates putting away: For one covers violence with his garment, says the LORD of hosts: therefore take heed to your spirit, that you deal not treacherously.