Matthew 24:21-22

for then shall be great affliction, such as has not been from the beginning of the world till now, nor shall ever be.

Mark 13:19

For these will be the days of affliction, such as has not been from the beginning of the creation which God created, till this time, and will never be.

Acts 2:20

The sun shall be turned into darkness, and the moon into blood, before that great and terrible day of the Lord comes.

Romans 11:26

And so all Israel shall be saved, as it is written: There shall come out of Zion the Deliverer, and he shall turn away ungodliness from Jacob.

Revelation 6:17

for the great day of his wrath has 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 shall be turned into darkness, and the moon into blood, before that great and terrible day of the Lord comes.
Revelation 6:17
for the great day of his wrath has come, and who is able to stand?

So

Matthew 24:21
for then shall be great affliction, such as has not been from the beginning of the world till now, nor shall ever be.
Mark 13:19
For these will be the days of affliction, such as has not been from the beginning of the creation which God created, till this time, and will never be.

But

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