Revelation 18:8

Therefore in one day shall her plagues come, even death and mourning and famine; and she shall be burnt with fire: for strong is the Lord God who judgeth her.

Revelation 6:17

for the great day of his wrath is come, and who can stand before Him?"

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, even death and mourning and famine; and she shall be burnt with fire: for strong is the Lord God who judgeth her.

Who

Revelation 6:17
for the great day of his wrath is come, and who can stand before Him?"