Matthew 19:7

They say to him, Why then did Moses give orders that a husband might give her a statement in writing and be free from her?

Deuteronomy 24:1-4

If a man takes a wife, and after they are married she is unpleasing to him because of some bad quality in her, let him give her a statement in writing and send her away from his house.

Matthew 5:31

Again, it was said, Whoever puts away his wife has to give her a statement in writing for this purpose:

Isaiah 50:1

This is the word of the Lord: Where is the statement which I gave your mother when I put her away? or to which of my creditors have I given you for money? It was for your sins that you were given into the hands of others, and for your evil-doing was your mother put away.

Jeremiah 3:8

And though she saw that, because Israel, turning away from me, had been untrue to me, I had put her away and given her a statement in writing ending the relation between us, still Judah, her false sister, had no fear, but went and did the same.

Malachi 2:16

For I am against the putting away of a wife, says the Lord, the God of Israel, and against him who is clothed with violent acts, says the Lord of armies: so give thought to your spirit and do not be false in your acts.

Matthew 1:19

And Joseph, her husband, being an upright man, and not desiring to make her a public example, had a mind to put her away privately.

Mark 10:4

And they said to him, Moses let us give her a statement in writing, and be free from her.

Treasury of Scripture Knowledge

Summary

They say unto him, Why did Moses then command to give a writing of divorcement, and to put her away?

General references

Bible References

Why

Matthew 5:31
Again, it was said, Whoever puts away his wife has to give her a statement in writing for this purpose:
Deuteronomy 24:1
If a man takes a wife, and after they are married she is unpleasing to him because of some bad quality in her, let him give her a statement in writing and send her away from his house.
Isaiah 50:1
This is the word of the Lord: Where is the statement which I gave your mother when I put her away? or to which of my creditors have I given you for money? It was for your sins that you were given into the hands of others, and for your evil-doing was your mother put away.
Jeremiah 3:8
And though she saw that, because Israel, turning away from me, had been untrue to me, I had put her away and given her a statement in writing ending the relation between us, still Judah, her false sister, had no fear, but went and did the same.
Mark 10:4
And they said to him, Moses let us give her a statement in writing, and be free from her.

And to

Matthew 1:19
And Joseph, her husband, being an upright man, and not desiring to make her a public example, had a mind to put her away privately.
Malachi 2:16
For I am against the putting away of a wife, says the Lord, the God of Israel, and against him who is clothed with violent acts, says the Lord of armies: so give thought to your spirit and do not be false in your acts.

General references

Mark 10:4
And they said to him, Moses let us give her a statement in writing, and be free from her.

Basic English, produced by Mr C. K. Ogden of the Orthological Institute - public domain