Luke 4:27:

And many lepers were in Israel in the time of Eliseus the prophet; and none of them was cleansed, saving Naaman the Syrian.

Notes on Luke 4:27:

Eliseus in this passage refers to Elisha.

This was from the message Jesus preached in His hometown during His first visit to Nazareth.  The people tried throw Him off a cliff for preaching this, but Jesus was supernaturally protected and was able to just walk through the crowd that wanted Him dead.  It is good to know that God does protection miracles, not just healing miracles and financial miracles.

The Naaman incident was an early precedent where God made an exception for a Gentile and extended a covenant blessing of Israel to someone outside the Israel’s covenant because he believed – at a time when the Israelites themselves were not walking in faith and receiving anything.

See also:

2 Kings 5:1-14
Notes on 2 Kings 5:1-14
Objection: Jesus Himself Pointed Out That There Were Many Lepers in Israel in Elijah’s Day, Yet Only Naaman the Syrian Was Cleansed (Luke 4:27)
Condition: Leprosy