Jeremiah 1:4-7
The word of the LORD came to me, saying, “Before I formed you in the womb I knew you, before you were born I set you apart; I appointed you as a prophet to the nations.” “Alas, Sovereign LORD,” I said, “I do not know how to speak; I am too young.” But the LORD said to me, “Do not say, ‘I am too young.’ You must go to everyone I send you to and say whatever I command you.
Jeremiah 1:4-7