Matthew 24:29-30

29But immediately after the tribulation of those days the sun shall be darkened, and the moon 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 land lament, and they shall see the Son of man coming on the clouds of heaven with power and great glory.