Mark 13:24-27

But in those days, after that tribulation, the sun shall be darkened, and the moon shall not give her light, and the stars shall be falling from heaven, and the powers that are in the heavens shall be shaken. And then shall they see the Son of man coming in clouds with great power and glory. And then shall he send forth the angels, and shall gather together his elect from the four winds, from the uttermost part of the earth to the uttermost part of heaven.