Exodus 3:13; Exodus 3:18

13 Then Moses said to God, "Behold, I am going to the sons of Israel, and I will say to them, 'The God of your fathers has sent me to you.' Now they may say to me, 'What is His name?' What shall I say to them?"

18 "They will pay heed to what you say; and you with the elders of Israel will come to the king of Egypt and you will say to him, 'The LORD , 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 the LORD our God.'