وَأَلْقِ عَصَاكَ"And throw down your stick!"Then He commanded him to throw down the stick that was in his hand, so that He might show him clear proof that He is the One Who is able to do all things, whatever He wills.When Musa threw that stick down, it changed into the form of a huge and terrifying snake, moving quickly despite its size.Allah says:... فَلَمَّا رَاهَا تَهْتَزُّ كَأَنَّهَا جَانٌّBut when he saw it moving as if it were a Jann (snake).Jann refers to a type of snake that is the fastest-moving and most agile.When Musa saw that with his own eyes,... وَلَّى مُدْبِرًا وَلَمْ يُعَقِّبْhe turned in flight, and did not look back.meaning, he did not turn around, because he was so afraid.Allah's saying:... يَا مُوسَى لَاا تَخَفْ إِنِّي لَاا يَخَافُ لَدَيَّ الْمُرْسَلُونَO Musa! Fear not:verily, the Messengers fear not in front of Me.means, `do not be afraid of what you see, for I want to choose you as a Messenger and make you a great Prophet.'إِلاَّ مَن ظَلَمَ ثُمَّ بَدَّلَ حُسْنًا بَعْدَ سُوءٍ فَإِنِّي غَفُورٌ رَّحِيم