Jas.11.14  But if you have bitter jealousy and selfish ambition in your hearts, do not boast and be false to the truth.
Rev.8.11  The name of the star is Wormwood. A third of the waters became wormwood, and many men died of the water, because it was made bitter.
Rev.10.9  So I went to the angel and told him to give me the little scroll; and he said to me, "Take it and eat; it will be bitter to your stomach, but sweet as honey in your mouth."
Rev.10.10  And I took the little scroll from the hand of the angel and ate it; it was sweet as honey in my mouth, but when I had eaten it my stomach was made bitter.