There are many stories in the Bible that talk about people who were jealous and the bad things they did as a result.
For example, in Genesis 4, we read about two brothers, Cain and Abel. When God liked Abel's offering better than Cain's, Cain became jealous and killed his brother.
In Genesis 29-30, Jacob married two sisters, Leah and Rachel. Since Jacob loved Rachel but not Leah, God allowed Leah to have children, but not Rachel. Rachel became nasty and competitive toward Leah because she was jealous that Leah could have children.
In 1 Samuel 18, King Saul became jealous of David's popularity after David killed the Philistine Goliath. King Saul was always plotting to do evil things to David and wanted to kill him. David had to flee from Saul many times to save his life.
God does not want us to be jealous and do bad things because of our jealousy. That is why the last of God's Ten Commandments in Exodus 20 tells us we should not covet anything that belongs to our neighbors.