Jeremiah 1:7 YLT

⁵  'Before I form thee in the belly, I have known thee; and before thou comest forth from the womb I have separated thee, a prophet to nations I have made thee.'

⁶  And I say, 'Ah, Lord Jehovah! lo, I have not known -- to speak, for I 'am' a youth.'

⁷  And Jehovah saith unto me, 'Do not say, I 'am' a youth, for to all to whom I send thee thou goest, and all that I command thee thou speakest.

⁸  Be not afraid of their faces, for with thee 'am' I to deliver thee, -- an affirmation of Jehovah.'

⁹  And Jehovah putteth forth His hand, and striketh against my mouth, and Jehovah saith unto me, 'Lo, I have put my words in thy mouth.