Matthew 24:27, 30, 48

For as the lightning cometh forth from the east, and is seen even unto the west; so shall be the coming of the Son of man.

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 on the clouds of heaven with power and great glory.

But if that evil servant shall say in his heart, My lord tarrieth