Insert your hand into the opening of your garment; it will come out white, without disease. And draw in your arm close to you [as prevention] from fear, for those are two proofs from your Lord to Pharaoh and his establishment. Indeed, they have been a people defiantly disobedient."
“Enter your right hand into your shirt collar, it will turn white upon you taking it out without any ailment.” So Moses placed it into his collar and removed it, with it having turned white like snow. “and draw your arm to your side” so Moses pressed it against his side and his fear subsided. So these two things that have been mentioned: the staff and the hand, are two proofs sent from your Lord to Pharaoh and the leaders from his people. Indeed, they were a nation who left the obedience of Allah by disbelief and sin.