Leprous: The instantaneous production and cure of the most malignant and subtle disease known to the Israelites was a sign of their danger i…

His hand was leprous as snow. —The worst form of leprosy was called by the Greeks λεύκη, “the white disease.” Wh…

Put now thy hand into thy bosom. By this sign Moses was instructed that what is in the greatest vigor withers away at once, at the command…

And the Lord said furthermore to him: Continued his discourse, and gave him another sign: put now your hand i…

Moses objects that the people would not take his word unle he showed them some sign. God gives him power to work miracles.