Exodus 4:4-6

Amplified Bible

⁴ But the Lord said to Moses, “Reach out your hand and grasp it by the tail.” So he reached out his hand and caught it, and it became a staff in his hand— ⁵ [“You shall do this,” said the Lord,] “so that the elders may believe that the Lord, the God of their fathers, the God of Abraham, the God of Isaac, and the God of Jacob, has [most certainly] appeared to you.”

⁶ The Lord also said to him, “Put your hand into your robe [where it covers your chest].” So he put his hand into his robe, and when he took it out, his hand was ^[a]leprous, as white as snow.