"29Immediately 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: 30And 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. 31And he 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."
https://biblehub.com/kjv/matthew/24.htm
"20And except that the Lord had shortened those days, no flesh should be saved: but for the elect's sake, whom he hath chosen, he hath shortened the days."
https://biblehub.com/kjv/mark/13.htm
"21Not every one that saith unto me, Lord, Lord, shall enter into the kingdom of heaven; but he that doeth the will of my Father which is in heaven."
https://biblehub.com/kjv/matthew/7.htm
"13Enter ye in at the strait gate: for wide is the gate, and broad is the way, that leadeth to destruction, and many there be which go in thereat: 14Because strait is the gate, and narrow is the way, which leadeth unto life, and few there be that find it."
https://biblehub.com/kjv/matthew/7.htm
"14And I said unto him, Sir, thou knowest. And he said to me, These are they which came out of great tribulation, and have washed their robes, and made them white in the blood of the Lamb."
https://biblehub.com/kjv/revelation/7.htm
"The battle of Armageddon refers to the final war between human governments and God. These governments and their supporters oppose God even now by refusing to submit to his rulership."
"“a great crowd” of God’s servants will survive."
https://www.jw.org/en/bible-teachings/questions/battle-of-armageddon/