Matthew 24:21

For at that time there will be great tribulation, unseen from the beginning of the world until now, and never to be seen again.

Berean Standard Bible
Other translations

King James Version

For then shall be great tribulation, such as was not since the beginning of the world to this time, no, nor ever shall be.

World English Bible

for then there will be great suffering, such as has not been from the beginning of the world until now, no, nor ever will be.

American Standard Version

for then shall be great tribulation, such as hath not been from the beginning of the world until now, no, nor ever shall be.

Geneva Bible 1599

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

Darby Translation

for then shall there be great tribulation, such as has not been from [the] beginning of [the] world until now, nor ever shall be;

Young's Literal Translation

for there shall be then great tribulation, such as was not from the beginning of the world till now, no, nor may be.

Bible in Basic English

Because in those days there will be great sorrow, such as there has not been from the start of the world till now, or ever will be.

In context

20Pray that your flight will not occur in the winter or on the Sabbath.

22If those days had not been cut short, nobody would be saved. But for the sake of the elect, those days will be cut short.

Read Matthew 24