Exodus 6:30

And Moses said before the Lord, behold, I am of uncircumcised
lips
As he had done, ( Exodus 6:13 ) , and this is only a repetition of what is there said, in order to lead on to what is related in the following chapter: how shall Pharaoh hearken unto me?
so mean a person, and so poor a speaker, and he a mighty king, surrounded with wise counsellors and eloquent orators.