There is a story in the Old Testament about a man named Naaman. He was an important man in his time as he commanded the entire army for the kingdom where he lived. He suffered from leprosy which in those days was a death sentence.
One day he heard about a prophet in Samaria who could cure leprosy, but when he heard what the cure was, he balked. What he was told to do was beneath his dignity. Eventually, he chose to humble himself, and his reward was that he was healed.
After saying this, he spit on the ground, made some mud with the saliva, and put it on the man’s eyes. “Go,’ he told him, “wash in the Pool of Siloam’ (this word means “Sent’). So the man went and washed, and came home seeing.