Old Testament readings use the Septuagint , the Scripture the apostles quoted. Masoretic numbering shown for reference.Learn why
WEB

Revelation 8:8

The second angel sounded, and something like a great burning mountain was thrown into the sea. One third of the sea became blood,

Parallel Translations

KJVView canonical →
And the second angel sounded, and as it were a great mountain burning with fire was cast into the sea: and the third part of the sea became blood;
King James Version

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