That there is an awful time of tribulation to
come on the people of the earth, is told in
many scriptures of the bible.

Jesus Himself said in Matthew 24:
"For then shall be great tribulation, such as
was not since the beginning of the world to
this time, no, nor ever shall be. And except
those days should be shortened, there should
no flesh be saved: but for the elect's sake
those days shall be shortened.
Then if any man shall say unto you, Lo, here
is Christ, or there; believe it not. For there
shall arise false Christs, and false prophets,
and shew great signs and wonders;
insomuch that, if it were possible, they shall
deceive the very elect." Matthew 24:21-24