Acts 8:23 - For I perceive that thou art in the gall of bitterness, G4088 and in the bond of iniquity.
Romans 3:14 - Whose mouth is full of cursing and bitterness: G4088
Ephesians 4:31 - Let all bitterness, G4088 and wrath, and anger, and clamour, and evil speaking, be put away from you, with all malice:
Hebrews 12:15 - Looking diligently lest any man fail of the grace of God; lest any root of bitterness G4088 springing up trouble you, and thereby many be defiled;