Romans 3:14
"Their mouth is full of curses and bitterness."
Psalm 10:7
His mouth is filled with cursing and deceit and oppression; under his tongue are mischief and iniquity.
Psalm 59:12
For the sin of their mouths, the words of their lips, let them be trapped in their pride. For the cursing and lies that they utter,
Psalm 109:17-18
He loved to curse; let curses come upon him! He did not delight in blessing; may it be far from him!
James 3:10
From the same mouth come blessing and cursing. My brothers, these things ought not to be so.