Matthew 24:21-22

For then shall be great tribulation, such as was not from the beginning of the world to this time, nor ever shall be.

Mark 13:19

For in those days shall be affliction, such as was not from the beginning of the creat`on, which God created until now, neither shall be.

Acts 2:20

blood and fire, and vapour of smoke, The sun shall be turned into darkness, and the moon into blood, before the day of the Lord, the great and illustrious day, come.

Romans 11:26

And so all Israel shall be saved, as it is written, The deliverer shall come out of Sion, and shall turn away iniquity from Jacob.

Revelation 6:17

For the great day of his wrath is come; and who shall be able to stand?

Treasury of Scripture Knowledge

Summary

Alas! for that day is great, so that none is like it: it is even the time of Jacob's trouble; but he shall be saved out of it.

Bible References

For

Acts 2:20
blood and fire, and vapour of smoke, The sun shall be turned into darkness, and the moon into blood, before the day of the Lord, the great and illustrious day, come.
Revelation 6:17
For the great day of his wrath is come; and who shall be able to stand?

So

Matthew 24:21
For then shall be great tribulation, such as was not from the beginning of the world to this time, nor ever shall be.
Mark 13:19
For in those days shall be affliction, such as was not from the beginning of the creat`on, which God created until now, neither shall be.

But

Romans 11:26
And so all Israel shall be saved, as it is written, The deliverer shall come out of Sion, and shall turn away iniquity from Jacob.