Mark 10:12

and if she divorces her husband and marries another man, she commits adultery."

(or if she has already left him let her either remain as she is, or be reconciled to him), and also that a husband is not to put away his wife.

And a woman whose husband is not a believer, if he is willing to live with her, let her not separate from him.

Treasury of Scripture Knowledge

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

"Every man who divorces his wife and marries some one else, commits adultery; and he who marries one who is put away by her husband commits adultery.

but her husband is; and in the same way the husband is not master of his own person, but his wife is.