Bible Verses for Reference:
Be you therefore ready also: for the Son of man comes at an hour when you think not (Luk 12:40).
But as the days of Noe were, so shall also the coming of the Son of man be (Mat 24:37).
For as the lightning comes out of the east, and shines even to the west; so shall also the coming of the Son of man be(Mat 24:27).
For as the lightning, that lightens out of the one part under heaven, shines to the other part under heaven; so shall also the Son of man be in his day. But first must he suffer many things, and be rejected of this generation (Luk 17:24-25).
And at midnight there was a cry made, Behold, the bridegroom comes; go you out to meet him (Mat 25:6).
Behold, I come as a thief (Rev 16:15).
If therefore you shall not watch, I will come on you as a thief, and you shall not know what hour I will come on you (Rev 3:3).
Behold, I stand at the door, and knock: if any man hear my voice, and open the door, I will come in to him, and will sup with him, and he with me (Rev 3:20).