'Bitter' in the Bible

And the name of the star was called Wormwood, and a third of the waters became wormwood, and many people died from the waters because they were made bitter.

And I went to the angel and told him to give me the little scroll, and he said to me, "Take and eat it up, and it will make your stomach bitter, but in your mouth it will be sweet as honey."

And I took the little scroll from the hand of the angel and ate it up, and it was sweet as honey in my mouth, and when I had eaten it, my stomach was made bitter.