Exodus 4 – The third and fouth objections raised by Moses.

Exo 4:1
Then Moses answered and said, "What if they will not believe me, or listen to what I say? For they may say, 'The LORD has not appeared to you.'"

This is the third objection by Moses. He has already said, "Who am I to deliver my people?" Then he objected, "What do I tell them your name is?" Now he asks, "What if they don't believe me or, or don't listen to me? What if they don't believe that You told me this?"
Exo 4:10
Then Moses said to the LORD, "Please, Lord, I have never been eloquent, neither recently nor in time past, nor since Thou hast spoken to Thy servant; for I am slow of speech and slow of tongue."

Exo 4:11
And the LORD said to him, "Who has made man's mouth? Or who makes him dumb or deaf, or seeing or blind? Is it not I, the LORD?

Exo 4:12
"Now then go, and I, even I, will be with your mouth, and teach you what you are to say."