فَأْتِيَاهُ فَقُولَآ إِنَّا رَسُولَا رَبِّكَ فَأَرْسِلْ مَعَنَا بَنِىٓ إِسْرَٰٓءِيلَ وَلَا تُعَذِّبْهُمْ ۖ قَدْ جِئْنَٰكَ بِـَٔايَةٍ مِّن رَّبِّكَ ۖ وَٱلسَّلَٰمُ عَلَىٰ مَنِ ٱتَّبَعَ ٱلْهُدَىٰٓ

Pharaoh was an extremely haughty and arrogant person. Having acquired power, he had started considering himself to be a god. So Moses feared that when the message of the real God was presented to him, he would flare up in anger. But God’s messengers are under His protection. So Moses was commanded to proceed and to be rest assured that Pharaoh, despite his great might and power, would not be able to do him any harm. The Israelites were monotheists like the Muslims. But, being in the midst of the polytheistic community of Egypt, they were badly affected by its polytheistic culture. Moreover, the rulers had subjected them to such privation and hard labour as to render them incapable of thinking about such higher realities as the oneness of God and the life hereafter. Therefore, Moses was instructed to remove the Israelites from this sphere and settle them elsewhere, so that they could be brought up and educated far away from this vitiating atmosphere of polytheism and ignorance.

— Source: Tazkirul Quran (Maulana Wahiduddin Khan) via Quran.com (20:47)