Va'era

G‑d tells Moses to go speak to Pharaoh, and Aaron should serve as his spokesman. G‑d informed him that He will harden Pharaoh's heart and he will refuse to release the Israelites. At that point G‑d will "multiply His wonders" in Egypt, until the Egyptians will recognize that G‑d is the L-rd. Fourth Aliyah: Moses and Aaron appeared before Pharaoh. As per G‑d's instructions, Aaron cast his staff on the ground, and it turned into a serpent. When Pharaoh's magicians did the same with their staffs, Aaron's staff swallowed theirs. Pharaoh remained unimpressed—and so the plagues commenced.

 Paper plate 7 first plaques