Mark 10:12

If a woman herself divorces her husband, and marries another, she commits adultery."

1 Corinthians 7:11

(but if she departs, let her remain unmarried, or else be reconciled to her husband), and that the husband not leave his wife.

1 Corinthians 7:13

The woman who has an unbelieving husband, and he is content to live with her, let her not leave her husband.

Treasury of Scripture Knowledge

Summary

And if a woman shall put away her husband, and be married to another, she committeth adultery.

Bible References

General references

Exodus 20:14
"You shall not commit adultery.
Luke 16:18
Everyone who divorces his wife, and marries another, commits adultery. He who marries one who is divorced from a husband commits adultery.
1 Corinthians 7:4
The wife doesn't have authority over her own body, but the husband. Likewise also the husband doesn't have authority over his own body, but the wife.