﴿ وَأَنْ أَلْقِ عَصَاكَ ۖ فَلَمَّا رَءَاهَا تَهْتَزُّ كَأَنَّهَا جَآنٌّۭ وَلَّىٰ مُدْبِرًۭا وَلَمْ يُعَقِّبْ ۚ يَٰمُوسَىٰٓ أَقْبِلْ وَلَا تَخَفْ ۖ إِنَّكَ مِنَ ٱلْءَامِنِينَ ﴾

“And [then He said]: “Throw down thy staff!” But as soon as [Moses] saw it move rapidly, as if it were a snake, he drew back [in terror], and did not [dare to] return. [And God spoke to him again:] “O Moses! Draw near, and have no fear - for, behold, thou art of those who are secure [in this world and in the next]!”

Please check ayah 28:32 for complete tafsir.