Judges 2:3 Wherefore I also said, I will not drive them out from before you; but they shall be as thorns in your sides, and their gods shall be a snare unto you.
God had told His people to drive the people out of the land that worshipped false gods. They did not. God would not drive them out. Those gods, their worship, their sin, their falsehood would become a trap to them. They would be the source of much frustration and heartache.
Much like that today, if you do not decide to get sin out of your life it will hurt you and your family. Get victory over sin. Do not risk yourself or your family by playing with sin!