Charles Spurgeon Commentary Matthew 5:32

"but I say unto you, that every one that putteth away his wife, saving for the cause of fornication, maketh her an adulteress: and whosoever shall marry her when she is put away committeth adultery." — Matthew 5:32 (ASV)

Committeth adultery.

Among the Jews, divorce was the easiest thing in the world. A man might, in a fit, utter words which would divorce his wife. The Saviour abolished that evil once for all, and made divorce a crime, as it always is saving for the cause of fornication.

Causeth her to commit adultery: and whosoever shall marry her that is divorced –

That is to say, who is divorced without sufficient cause –