Thou therefore gird up thy loins and arise, and speak to them all that I command thee. Be not afraid at their presence: for I will make thee not to fear their countenance.
And the Lord said to me: Say not: I am a child: for thou shalt go to all that I shall send thee, and whatsoever I shall command thee, thou shalt speak.
You shall not add to the word that I speak to you: neither shall you take away from it. Keep the commandments of the Lord your God which I command you.
After these things Moses and Aaron went in, and said to Pharao: Thus saith the Lord God of Israel: Let my people go that they may sacrifice to me in the desert.