Parallel
Jeremiah 9:7
Brenton's English Septuagint · Berean Standard Bible
Their tongue is a wounding arrow; the words of their mouth are deceitful: [one] speaks peaceably to his neighbour, but in himself retains enmity.
9:8
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.