Exodus:4:6-7
rsv@Exodus:4:6 @ Again, the LORD said to him, "Put your hand into your bosom." And he put his hand into his bosom; and when he took it out, behold, his hand was leprous, as white as snow.
rsv@Exodus:4:7 @ Then God said, "Put your hand back into your bosom." So he put his hand back into his bosom; and when he took it out, behold, it was restored like the rest of his flesh.