12 I said, “Who is wise enough to understand why this has happened? Who has a word from the Lord that can explain it? Why does the land lie in ruins? Why is it as scorched as a desert through which no one travels?” 13 The Lord answered, “This has happened because these people have rejected my laws that I gave them. They have not obeyed me or followed those laws. 14 Instead they have followed the stubborn inclinations of their own hearts. They have paid allegiance to the gods called Baal, as their fathers taught them to do. 15 So then, listen to what I, the Lord of Heaven’s Armies, the God of Israel, say, ‘I will make these people eat the bitter food of suffering and drink the poison water of judgment. 16 I will scatter them among nations that neither they nor their ancestors have known anything about. I will send people chasing after them with swords until I have destroyed them.’”
10 Then the third angel blew his trumpet, and a huge star burning like a torch fell from the sky; it landed on a third of the rivers and on the springs of water. 11 (Now the name of the star is Wormwood.) So a third of the waters became wormwood, and many people died from these waters because they were poisoned. 12 Then the fourth angel blew his trumpet, and a third of the sun was struck, and a third of the moon, and a third of the stars, so that a third of them were darkened. And there was no light for a third of the day and for a third of the night likewise. 13 Then I looked, and I heard an eagle flying directly overhead, proclaiming with a loud voice, “Woe! Woe! Woe to those who live on the earth because of the remaining sounds of the trumpets of the three angels who are about to blow them!”
Notes and References
"... The transformation of waters to wormwood and the subsequent deaths (Revelation 8:10–11) are the reverse of the miracle at Marah, where bitter and undrinkable water was made drinkable (Exodus 15:25). Moreover, in Jeremiah 9:15 Yahweh says that he will feed Judah with wormwood and give them poisonous water to drink because they have forsaken him and practiced idolatry (compare Jeremiah 9:14). Jeremiah 23:15 makes the same threat against the false prophets ..."
Martin, Ralph P. Dictionary of the Later New Testament & Its Developments (p. 1677) InterVarsity Press, 1997