He charged him to tell no one, "But go your
way, and show yourself to the priest,
and offer for your cleansing according to what Moses commanded,
for a testimony to them."
What does this reveal about Jesus?
He has power to cleanse physically "incurable diseases with a word
This leper was motivated to seek healing from Jesus because he had confidence that Jesus could heal him and because he believed that Jesus loved him and was thus willing to do so.
But when God works in our life, we should not simply view this selfishly for our own good, but rather we should consider how we can use these to testify of God. Jesus' miracles affirmed who He was. The testimony Jesus was referring to here can be found in Leviticus 13. Leprosy was not only a disease, but also incurred a status. Lepers could be officially declared clean and be freed from such status. But having been cleansed, this leper going through such an examination would affirm to the priests through physical evidence that Jesus was the Son of God.