Delilah foolishly went against Samson and the Israelites by betraying him for money.
Delilah in the Bible is best known as the one who brought about the ruin of Samson. Delilah lived in the Valley of Sorek, which lay on the border between the territories of the ancient Philistines and the Israelite tribe of Dan. Samson, one of the judges of Israel, had an affair with Delilah, and she betrayed him to the Philistines (Judges 16:19).
The various forms of Philistine and Philistia appear almost 300 times in the OT, mostly in the books of Judges and Samuel. The Philistines who regularly oppose the Israelites in the biblical narratives are believed to have been part of the so-called “Sea Peoples “—a confederacy of seafaring raiders who invaded the eastern Mediterranean at the end of the Bronze Age (around 1200 BC).
The Philistines occupied a small region in southwestern Canaan, where they established the so-called Philistine Pentapolis, which included the cities of Gaza, Ashkelon, Ashdod, Ekron, and Gath.
Samson and many Israelites did not obey God's commands to be holy and to beware of the influence of nonbelievers.