A town that has gates and bars. (1 Samuel 23:7)
When the prophet Gad advised David to return to Judah, he heard the Philistines were fighting against Keilah and were robbing the threshing floors. David and his men went to Keilah and fought with the Philistines and brought away their livestock and struck them down with a great blow. So David saved the inhabitants of Keilah.
Abiathar fled to Keilah, ephod in hand, and David requested it to ask if Saul was coming and if Keilah would surrender him and his men into Saul's hand. God affirmed both concerns. So David escaped to Ziph. (1 Samuel 23:1-14)