Exodus 5:6; Exodus 8:19; Exodus 16:23

Exodus 5:6

6 So the same day Pharaoh commanded the taskmasters over the people and their foremen, saying,

Exodus 8:19

19 Then the magicians said to Pharaoh, "This is the finger of God." But Pharaoh's heart was hardened, and he did not listen to them, as the LORD had said.

Exodus 16:23

23 then he said to them, "This is what the LORD meant: Tomorrow is a sabbath observance, a holy sabbath to the LORD . Bake what you will bake and boil what you will boil, and all that is left over put aside to be kept until morning."