Before I formed thee in the belly I knew thee; and before thou camest forth out of the womb I sanctified thee, and I ordained thee a prophet unto the nations. Then said I, Ah, Lord GOD! behold, I cannot speak: for I am a child. But the LORD said unto me, Say not, I am a child: for thou shalt go to all that I shall send thee, and whatsoever I command thee thou shalt speak.
For he shall be great in the sight of the Lord, and shall drink neither wine nor strong drink; and he shall be filled with the Holy Ghost, even from his mother's womb.
And the child grew, and waxed strong in spirit, and was in the deserts till the day of his shewing unto Israel.
1 Samuel 2:18
But Samuel ministered before the LORD, being a child, girded with a linen ephod.
1 Samuel 2:3
Talk no more so exceeding proudly; let not arrogancy come out of your mouth: for the LORD is a God of knowledge, and by him actions are weighed.