Quran 7:107 — The Purgatory (Al-A'araf)

فَأَلقىٰ عَصاهُ فَإِذا هِىَ ثُعبانٌ مُبينٌ

He threw down his staff, and it turned into a tremendous serpent.

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

[7:108] He took out his hand, and it was white to the beholders.