Envy

Now the men of Ephraim came together and took up arms and went over to Zaphon; and they said to Jephthah, Why did you go over to make war against the children of Ammon without sending for us to go with you? Now we will put your house on fire over you.
Judges 12:1

And Jephthah said to them, I and my people were in danger, and the children of Ammon were very cruel to us, and when I sent for you, you gave me no help against them.
Judges 12:2

So when I saw that there was no help to be had from you, I put my life in my hand and went over against the children of Ammon, and the Lord gave them into my hands: why then have you come up to me this day to make war on me?
Judges 12:3

1)Jas 3:16 For where envy is, and the desire to get the better of others, there is no order, but every sort of evil-doing.

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1.Jas 3:16 For where envy is, and the desire to get the better of others, there is no order, but every sort of evil-doing.

False worship of things of the world, lead to the worship of false Gods

And Gideon made an ephod from them and put it up in his town Ophrah; and all Israel went after it there and were false to the Lord; and it became a cause of sin to Gideon and his house.
Judges 8:27

And after the death of Gideon, the children of Israel again went after the gods of Canaan and were false to the Lord, and made Baal-berith their god.
Judges 8:33