Is it not a lesson for the successors of the past generations that had We wanted, We could have punished them for their sins, sealed their hearts and deprived them of hearing? 100 To those [earlier] communities - some of whose stories We relate to you - there had indeed come Messengers with clear proofs, but they would not believe what they had once rejected as false. Thus it is that Allah seals the hearts of those who deny the truth. 101 We did not find many among them keeping their promises. However, We did find many evil-doers among them. 102 Then we raised after them Musa with Our communications to Firon and his chiefs, but they disbelieved in them; consider then what was the end of the mischief makers. 103 Moses said: "O Pharaoh, I have been sent by the Lord of all the worlds; 104 I must only speak what is true about God. I have brought you miracles from your Lord; therefore, let the children of Israel go free". 105 [Pharaoh] said, "If you have come with a sign, then bring it forth, if you should be of the truthful." 106 Thereupon Moses threw his rod, and suddenly it was a veritable serpent. 107 And he drew out his hand, and behold! it was white (with radiance) for the beholders. 108