Exodus 4:1-8 New Revised Standard Version (NRSV)
Moses’ Miraculous Power
4 Then Moses answered, “But suppose they do not believe me or listen to me, but say, ‘The Lord did not appear to you.’” 2 The Lord said to him, “What is that in your hand?” He said, “A staff.” 3 And he said, “Throw it on the ground.” So he threw the staff on the ground, and it became a snake; and Moses drew back from it. 4 Then the Lord said to Moses, “Reach out your hand, and seize it by the tail”—so he reached out his hand and grasped it, and it became a staff in his hand— 5 “so that they may believe that the Lord, the God of their ancestors, the God of Abraham, the God of Isaac, and the God of Jacob, has appeared to you.”
6 Again, the Lord said to him, “Put your hand inside your cloak.” He put his hand into his cloak; and when he took it out, his hand was leprous,[a] as white as snow. 7 Then God said, “Put your hand back into your cloak”—so he put his hand back into his cloak, and when he took it out, it was restored like the rest of his body— 8 “If they will not believe you or heed the first sign, they may believe the second sign.