27 These are they that speak to Pharao king of Egypt, in order to bring out the children of Israel from Egypt: these are that Moses and Aaron
28 In the day when the Lord spoke to Moses in the land of Egypt.
29 And the Lord spoke to Moses, saying: I am the Lord: speak thou to Pharao king of Egypt all that I say to thee.
30 And Moses said before the Lord: Lo I am of uncircumcised lips, how will Pharao hear me?