'Enemy' in the Bible

"If your people Israel are defeated in a battle with their enemy because they have sinned against you, when they return to you and confess to you, pray, and in this Temple they ask you to show grace to them,

"When they sin against you because there isn't a single human being who doesn't sin and you become angry with them and deliver them over to their enemy, who takes them away captive to the land that belongs to their enemy, whether near or far away,

Later on, Ahab asked Elijah, "Have you found me, my enemy?"