Shemot 6:29-30

Orthodox Jewish Bible

²⁹ That Hashem spoke unto Moshe, saying, I am Hashem: speak thou unto Pharaoh Melech Mitzrayim all that I say unto thee.

³⁰ And Moshe said before Hashem, See, I am of aral sefatayim,and why should Pharaoh pay heed unto me.