Jeremiah
Jeremiah 9:8BSB·traditional attribution

Their tongues are deadly arrows; they speak deception. With his mouth a man speaks peace to his neighbor, but in his heart he sets a trap for him.

John Calvin Reformed @genevareformer

The Prophet again complains of the deceitfulness of their tongues; and he compares them to deadly, or drawn out arrows. Gold is said to be drawn out, when refined by repeated meltings; so also arrows, when sharpened, are more piercing. The Prophet then says, that their tongues were like deadly or sharpened arrows: how so? because they ever spoke guile, by either slandering or circumventing others.

Matthew Henry Presbyterian @wholebiblehenry

The prophet, being commissioned both to foretel the destruction coming upon Judah and Jerusalem and to point out the sin for which that destruction was brought upon them, here, as elsewhere, speaks of both very feelingly: what he said of both came from the heart, and therefore one would have thought it would reach to the heart. I.

Commenting on Jeremiah 9:1-11

John Gill Reformed Baptist @doctorgill

Their tongue is as an arrow shot out,.... As an arrow out of a bow, which moves swiftly, and comes with great force; or, "drawn out" (u); as out of a quiver. The word is used of gold, and rendered "beaten gold", Kg1 10:16, gold drawn out into plates; and here of an arrow drawn out of a quiver; and so it is interpreted in...