Matthew 24:21-22
For then there will be great tribulation, such as has not been from the beginning of the world until now, no, and never will be.
Mark 13:19
For in those days there will be tribulation, such as has not been from the beginning of the creation which God created until now, and never will be.
Acts 2:20
The sun will be turned into darkness and the moon into blood, before the great and glorious day of the Lord shall come.
Romans 11:26
And so all Israel will be saved, as it is written: "The Deliverer will come from Zion, he will turn away ungodliness from Jacob;
Revelation 6:17
for the great day of their wrath has come, and who can stand?"