Proverbs 18:8
The words of one who says evil of his neighbour secretly are like sweet food, and go down into the inner parts of the stomach.
Proverbs 16:28
A man of twisted purposes is a cause of fighting everywhere: and he who says evil secretly makes trouble between friends.
Leviticus 19:16
Do not go about saying untrue things among your people, or take away the life of your neighbour by false witness: I am the Lord.
Psalm 52:2
Purposing destruction, using deceit; your tongue is like a sharp blade.
Psalm 64:3-4
Who make their tongues sharp like a sword, and whose arrows are pointed, even bitter words;
Proverbs 12:18
There are some whose uncontrolled talk is like the wounds of a sword, but the tongue of the wise makes one well again.
Proverbs 26:20-22
Without wood, the fire goes out; and where there is no secret talk, argument is ended.