Revelation 10:8–11 records that the voice John heard from heaven commanded him to take the scroll from the mighty angel’s hand. John obeys the instruction and is told by the mighty angel to eat the scroll. Upon eating the scroll, John finds it is sweet to the taste but bitter to his stomach. John receives word that he must prophesy again about many people and nations and languages and kings. The rest of the book of Revelation unfolds what lies
ahead for the Gentiles and the people of Israel.
For a more detailed summary select the link below.
“Revelation 10:10” Bibleref.com
10 I took the little book out of the angel’s hand,and ate it. It was as sweet as honey in my mouth. When I had eaten it, my stomach was made bitter.