Matthew 24:21-22

For there will then be great distress, such as hath not been from the beginning of the world to this time; no, nor shall ever be.

Mark 13:19

For those days will be a time of distress, such as hath not been from the beginning of the creation which God created until now, nor shall be.

Acts 2:20

the sun will be turned into darkness and the moon into blood, before the day of the Lord cometh, the great and notable day.

Romans 11:26

And thus will all Israel be saved; as it is written, "There shall come out of Zion the Deliverer; he shall turn away ungodliness from Jacob.

Revelation 6:17

for the great day of his wrath is come, and who is 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
the sun will be turned into darkness and the moon into blood, before the day of the Lord cometh, the great and notable day.
Revelation 6:17
for the great day of his wrath is come, and who is able to stand?

So

Matthew 24:21
For there will then be great distress, such as hath not been from the beginning of the world to this time; no, nor shall ever be.
Mark 13:19
For those days will be a time of distress, such as hath not been from the beginning of the creation which God created until now, nor shall be.

But

Romans 11:26
And thus will all Israel be saved; as it is written, "There shall come out of Zion the Deliverer; he shall turn away ungodliness from Jacob.