Matthew Poole and continuators on Jeremiah 1:9

9 Then the LORD put forth his hand , and touched my mouth, and the LORD said unto me, Behold, I have put my words in thy mouth.

God having before excited the Prophet to his work by command, and promise, doth now in a vision establish and confirm him, either by the hand of an Angel, as Isa. 6.6, 7. Or, rather, by himself in some visible shape.

Heb. Came upon, as the word is used Iudg. 20.41. hereby enabling him to speak, or thou shalt be my mouth to deliver my words, partly to let Ieremy understand that they were God's words; and partly to intimate they should be effectual, and partly that he should never be without them, but continually supplied, see the like kind of phrase, chap. 5.14, and he adds Behold, q. d. attend to what I am about to say; or, look upon this outward sign, and let it assure thee of the thing signified.

Marginal references: chap. 5.14.