A mighty strong angel appears with a book open in his hand, 1-5. He swears by him who lives forever that there shall be no more time, 6-8. John is commanded to take and eat the book, 9-11.
1 And I saw another mighty angel come down from heaven clothed with a cloud and a rainbow upon his head. His face was like the sun and his feet as pillars of fire. 2 And he had in his hand a little book opened. And he set his right foot upon the sea and his left foot on the earth, 3 And cried with a loud voice, as when a lion roars. And when he had cried, seven thunders uttered their voices. 4 And when the seven thunders had uttered their voices, I was about to write, but I heard a voice from heaven saying to me, "Seal up those things which the seven thunders uttered and do not write them." 5 And the angel which I saw stand upon the sea and upon the earth lifted up his hand to heaven, 6 And swore by him who lives forever and ever, who "created heaven and the things that are in it, the earth and the things that are in it, and the sea and the things which are in it," that there should be time no longer. 7 But in the days of the voice of the seventh angel, when he is about to sound, then the mystery of God is finished, as he has declared to his servants the prophets.
8 And the voice which I heard from heaven spoke to me again, and said, "Go, and take the little book which is open in the hand of the angel which stands upon the sea and upon the earth." 9 And I went to the angel and said to him, "Give me the little book." And he said to me, "Take it and eat it. It shall make your belly bitter, but it shall be in your mouth sweet as honey." 10 And I took the little book out of the angel's hand and ate it. And it was in my mouth sweet as honey, but as soon as I had eaten it, my belly was bitter. 11 And he said to me, "You must prophesy again before many peoples, nations, languages, and kings."
Matthew Henry Commentary - Revelation, Chapter 10[➚]
[v.6] - Quoting Exodus 20:11 (LXX—paraphrased).