Quran 7:105 — The Purgatory (Al-A'araf)

"It is incumbent upon me that I do not say about GOD except the truth. I come to you with a sign from your Lord; let the Children of Israel go."

[7:104] Moses said, "O Pharaoh, I am a messenger from the Lord of the universe.

[7:106] He said, "If you have a sign, then produce it, if you are truthful."