Revelation 18:8

therefore in one day shall her plagues come, death, and mourning, and famine; and she shall be utterly burnt up with fire: because God, the one judging her, is a mighty Lord.

Revelation 6:17

because the great day of their wrath has come; and who is able to stand?

Treasury of Scripture Knowledge

Summary

And the LORD shall utter his voice before his army: for his camp is very great: for he is strong that executeth his word: for the day of the LORD is great and very terrible; and who can abide it?

Bible References

He is

Revelation 18:8
therefore in one day shall her plagues come, death, and mourning, and famine; and she shall be utterly burnt up with fire: because God, the one judging her, is a mighty Lord.

Who

Revelation 6:17
because the great day of their wrath has come; and who is able to stand?