Proverbs 25

 The words of Romans 12:20 have passed through a lot of history before being penned by Paul. "If your enemy is hungry, feed him..." was a principle that the apostle surely memorized from Proverbs 25:21. This collection of wisdom was recorded by Hezekiah's scribes but attributed to Soloman. Only one king in Israel ever put this principle into practice. In 2 Kings 6:22 Elisha asked God to blind the eyes of the Syrian army and then led them into Samaria. There the prophet commanded the king to feed this army of his enemies. The result of this ridiculous plan repulsed the Syrian army from Israel.   
Stuart