Matthew 24:21-22
for then will be great tribulation, such as has not happened from the beginning of the world until now; no, nor ever shall be.
Mark 13:19
for those days will be a time of tribulation, such as there has not been the like from the beginning of the creation which God created until now, and never will be.
Acts 2:20
The sun shall be turned into darkness, and the moon into blood, before the great and notable day of the Lord come.
Romans 11:26
and so all Israel shall be saved; even as it has been written, "There will come out of Zion the Deliverer; He will turn away ungodliness from Jacob;
Revelation 6:17
because the great day of their wrath came, and who is able to stand?"