"Ah, Lord GOD," I said, "I surely do not know how to speak, for I am only a child!" But the LORD told me: "Do not say, 'I am only a child.' For to everyone I send you, you must go, and all that I command you, you must speak. Do not be afraid of them, for I am with you to deliver you," declares the LORD. Then the LORD reached out His hand, touched my mouth, and said to me: "Behold, I have put My words in your mouth.
I will raise up for them a prophet like you from among their brothers. I will put My words in his mouth, and he will tell them everything I command him.
Significance
The entire sequence of Jeremiah 1:6-9 is structured as a fulfillment of Deuteronomy 18:18. God's promise to raise up a prophet and "put My words in his mouth" (וְנָתַתִּי דְבָרַי בְּפִיו, venatatti devarai befiv) is enacted literally when God touches Jeremiah's mouth and declares "I have put My words in your mouth" (נָתַתִּי דְבָרַי בְּפִיךָ, natatti devarai befika). The near-identical Hebrew phrasing — differing only in the pronominal suffix — signals that Jeremiah's commissioning is a concrete instantiation of the Mosaic prophetic office. God's command that Jeremiah speak "all that I command you" (v. 7) further echoes Deuteronomy 18:18's "everything I command him," confirming Jeremiah as a Deuteronomic prophet who mediates God's word to the people.