Exodus 4:1
But Moses protested again, "What if they won't believe me or listen to me? What if they say, 'The LORD never appeared to you'?"

Exodus 4:10
But Moses pleaded with the LORD, "O Lord, I'm not very good with words. I never have been, and I'm not now, even though you have spoken to me. I get tongue-tied, and my words get tangled."

Exodus 6:12
"But LORD!" Moses objected. "My own people won't listen to me anymore. How can I expect Pharaoh to listen? I'm such a clumsy speaker!"

Isaiah 6:5
Then I said, "It's all over! I am doomed, for I am a sinful man. I have filthy lips, and I live among a people with filthy lips. Yet I have seen the King, the LORD of Heaven's Armies."

Jeremiah 1:6
"O Sovereign LORD," I said, "I can't speak for you! I'm too young!"