Genesis 10:6 and 13-14 instructs us that the Philistines came from the line of Noah through his son Ham who begat Mizraim who begat Casluhim -- whence went forth the Philistines.
Genesis 10:13-14 And Mizraim begot Ludim, and Anamim, and Lehabim, and Naphtuhim, and Pathrusim, and Casluhim--whence went forth the Philistines--and Caphtorim.
Then turn to Exodus 13, verses 17-18 where God instructs:
The Philistines haven't gone anywhere, they have not disappeared from history, they still live in the same place where their ancestors lived, and have intermingled even further since the Islamic conquest of the region in the 7th century AD. There are even greater details that I could cite from the text of Moses in Genesis and of Asaph in Psalm 83, but this should serve to make the point I have made sufficiently.