Quran 7:133 — The Purgatory (Al-A'araf)

Consequently, we sent upon them the flood, the locusts, the lice, the frogs, and the blood—profound signs. But they maintained their arrogance. They were evil people.

[7:132] They said, "No matter what kind of sign you show us, to dupe us with your magic, we will not believe."

[7:134] Whenever a plague afflicted them, they said, "O Moses, implore your Lord—you are close to Him. If you relieve this plague, we will believe with you, and will send the Children of Israel with you."