The Eternal repeats twice that He is jealous, first he says that His name is HaShem-Jealous – HaShem kanà shemò,   יי קנא שמו– and then that He is a jealous God. When the Scriptures repeat something twice or more it is because they want to emphasize the matter and in order for the reader not to forget the issue. The Torah says that his name is HaShem-Jealous, which implies that jealousy is a part of His character, the way He is.

When He created men in His image and after His likeness He also passed on this feature. Therefore, man can also feel jealousy. I think that the strongest jealousy feelings are between a man and a woman. If a third person gets involved in a relationship between a couple, strong feelings of jealousy arise in the one who feels rejected. If a man or a woman commit adultery, the spouse feels jealous, as it is written in Proverbs 6:32-35:

 “But a man who commits adultery lacks judgment; whoever does so destroys himself. Blows and disgrace are his lot, and his shame will never be wiped away; for jealousy arouses a husband's fury, and he will show no mercy when he takes revenge. He will not accept any compensation; he will refuse the bribe, however great it is." (NIV)

And in Proverbs 27:4 is written:

"Anger is cruel and fury overwhelming, but who can stand before jealousy? (NIV)

Another example of strong jealousy is that of a mother who feels someone is trying to take her children from her.

These feelings that we've all experienced to a greater or lesser degree give us a hint of how the Eternal's jealousy is. If we compare the relationship between the Eternal and Israel with the relationship of a couple, we can understand how the Eternal reacted when Israel prostituted herself with a false god. All His jealousy was aroused.