Exodus 6:27-30 Amplified Bible (AMP)

27. And who spoke to [the] Pharaoh king of Egypt about bringing the Israelites out of Egypt; these are that Moses and Aaron.

28. On the day when the Lord spoke to Moses in Egypt,

29. The Lord said to Moses, I am the Lord; tell Pharaoh king of Egypt all that I say to you.

30. But Moses said to the Lord, Behold, I am of deficient and impeded speech; how then shall Pharaoh listen to me?

Exodus 6