'Bitter' in the Bible

The name of the star is called Wormwood; and a third of the waters became wormwood, and many men died from the waters, because they were made bitter.

So I went to the angel, telling him to give me the little book. And he *said to me, “Take it and eat it; it will make your stomach bitter, but in your mouth it will be sweet as honey.”

I took the little book out of the angel’s hand and ate it, and in my mouth it was sweet as honey; and when I had eaten it, my stomach was made bitter.