Matthew 24:22: “And except those days" [3 ½ years] "should be shortened, there should no flesh be saved: but for the elect's sake those days shall be shortened.”
Matthew 24:29: “Immediately after the tribulation of those days shall the sun be darkened, and the moon shall not give her light, and the stars shall fall from heaven, and the powers of the heavens shall be shaken:”
Matthew 24:30: “And then shall appear the sign of the Son of man in heaven: and then shall all the tribes of the earth mourn, and they shall see the Son of man coming in the clouds of heaven with power and great glory.”
Matthew 24:31: “And he” [Christ] “shall send his angels with a great sound of a trumpet, and they shall gather together his elect from the four winds, from one end of heaven to the other.”
Daniel 12:1: "…and there shall be a time of trouble, such as never was since there was a nation even to that same time: and at that time thy people shall be delivered, every one that shall be found written in the book."