Exodus 5:3

“And they will listen to your voice; and you with the elders of Israel will come to the king of Egypt, and you all will say to him, ‘Yahweh, the God of the Hebrews, has met with us. So now, please, let us go a three days’ journey into the wilderness, that we may sacrifice to Yahweh our God.’

“And you shall say to him, ‘Yahweh, the God of the Hebrews, sent me to you, saying, “Let My people go, that they may serve Me in the wilderness. But behold, you have not listened until now.”

Then Yahweh said to Moses, “Come to Pharaoh and say to him, ‘Thus says Yahweh, “Let My people go, that they may serve Me.

And Yahweh said to Moses, “Rise early in the morning and stand before Pharaoh as he comes out to the water, and you shall say to him, ‘Thus says Yahweh, “Let My people go, that they may serve Me.

“We must go a three days’ journey into the wilderness and sacrifice to Yahweh our God as He says to us.”