That which Moses lifted up for the healing of the Israelites was a likeness, not of those who were suffering, but of that from which they were suffering.
"The Expositor's Bible: The Gospel of St. John, Vol. I"
Marcus Dods
A still more striking physical symbol of this aspect of our Lord's person and work is found in His healing of the blind man.
"The Expositor's Bible: The Gospel of St. John, Vol. I"
Marcus Dods
It is not a sin, when it is for the healing?
"The Eye of Dread"
Payne Erskine