Ezekiel 25

"Say to the Ammonites, ‘Hear the word of the Lord God! Thus says the Lord God: “Because you said, ‘Aha!’ against My sanctuary when it was profaned, and against the land of Israel when it was desolate, and against the house of Judah when they went into captivity...‘Thus says the Lord God: “Because the Philistines dealt vengefully and took vengeance with a spiteful heart, to destroy because of the old hatred,” vv.3, 15

Read chapter 25
This chapter speaks of four other nations that will receive judgment from the Lord because of they gloating and happiness of Israel's judgement.  The Amorites say "Aha!" that the glory of Israel, the temple, was desecrated; the Moabites look on them as "normal" and no longer of fear; the Edomites took revenge and felt guilty (knowing their wrong); and the Philistines had malice in their hearts, holding grudges from the past.  All this was bitter envy and jealousy towards Israel revealing they wished harm than prosperity.  How often does bitterness and jealousy cause people to wish harm or hardship on others!  How often do you wish hardship on someone that seems like everything is perfect in their life just so they can experience difficulty and suffering?  Even if someone gets what they deserve we ought not to take advantage or gloat over it.  Where do you need to repent of thoughts like these or check yourself of evil hopes towards certain people?