اسْلُكْ يَدَكَ فِي جَيْبِكَ تَخْرُجْ بَيْضَاءَ مِنْ غَيْرِ سُوءٍ وَاضْمُمْ إِلَيْكَ جَنَاحَكَ مِنَ الرَّهْبِ ۖ فَذَانِكَ بُرْهَانَانِ مِن رَّبِّكَ إِلَىٰ فِرْعَوْنَ وَمَلَئِهِ ۚ إِنَّهُمْ كَانُوا قَوْمًا فَاسِقِينَ (32)
(28:32) Put your hand into your bosom: it will come out shining, without any harm to you ; *44 and fold back your arm to ward off fear. *45 These are two clear Signs from your Lord to be shown to Pharaoh and his courtiers: they are very disobedient people indeed. " *46
*44) These two miracles were shown to the Prophet Moses at that time so that, firstly, he himself is fully convinced that the same Being Who is speaking to him is, in fact, the Creator and Master and Ruler of the whole system of the universe and secondly, he should have full satisfaction that he was not going unarmed before Pharaoh, to perform the dangerous mission assigned to him, but would go well armed with the two powerful weapons.
*45) That is, "Whenever you experience the fear of any danger, fold back your arm to yourself: this will strengthen your heart and will deliver you completely from every feeling of fear and dread." The arm probably implies the right arm. The arm can be folded back in two ways: either by bringing the arm and pressing it against the side, or by pressing one hand under the armpit of the other. Probably the first way was implied, for in that case the other person cannot perceive that one is specially doing so in order to ward off fear.
The Prophet Moses was taught this device because he was being sent to counter a tyrannical government without any army and worldly equipment. He was going to meet with many a dreadful situation when a great Prophet also could not remain safe from fear and terror. AIlah said to him, "Whenever you face such a situation, just do this* and Pharaoh will not be able to shake your heart in spite of all the power of his mighty kingdom."
*46) The words by themselves imply: "Go to Pharaoh with these Signs and present yourself as Allah's Messenger, and invite him and his chiefs to the obedience and worship of Allah, Lord of the worlds." That is why his appointment has not been specified here, though at other places it has been clearly stated, thus: 'Go to Pharaoh for he has become rebellious' "(Ta Ha: 24) And: "When your Lord called Moses, saying: "Go forth to the wicked people--the people of Pharaoh'." (Ash-Shu'araa: 10).