Then the LORD put forth his hand, and {k} touched my mouth. And the LORD said to me, Behold, I have put my words in thy mouth.

(k) Which declares that God makes them meet and assures them, whom he calls to set forth his glory, giving them all means necessary for the same, Ex 4:12, Isa 6:7.

Wesley's Notes

1:9 Then - God having excited the prophet by command and promise, now in a vision confirms him, either by the hand of an angel, or by himself in some visible shape.

Jamieson-Fausset-Brown Bible Commentary

9. touched my mouth-a symbolical act in supernatural vision, implying that God would give him utterance, notwithstanding his inability to speak (Jer 1:6). So Isaiah's lips were touched with a living coal (Isa 6:7; compare Eze 2:8, 9, 10; Da 10:16).

Matthew Henry's Concise Commentary

1:1-10 Jeremiah's early call to the work and office of a prophet is stated. He was to be a prophet, not to the Jews only, but to the neighbouring nations. He is still a prophet to the whole world, and it would be well if they would attend to these warnings. The Lord who formed us, knows for what particular services and purposes he intended us. But unless he sanctify us by his new-creating Spirit, we shall neither be fit for his holy service on earth, nor his holy happiness in heaven. It becomes us to have low thoughts of ourselves. Those who are young, should consider that they are so, and not venture beyond their powers. But though a sense of our own weakness and insufficiency should make us go humbly about our work, it should not make us draw back when God calls us. Those who have messages to deliver from God, must not fear the face of man. The Lord, by a sign, gave Jeremiah such a gift as was necessary. God's message should be delivered in his own words. Whatever wordly wise men or politicians may think, the safety of kingdoms is decided according to the purpose and word of God.