'Enemy' in the Bible

Do not rejoice when your enemy falls, and when he stumbles do not let your heart rejoice,

If your enemy is hungry, give him food to eat, and if he is thirsty, give him water to drink,

Faithful are the wounds of a friend, but the kisses of an enemy are excessive.

Whoever shares with a thief is his own enemy; he hears the oath to testify, but does not talk.