Revelation 3:20
"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."
Cross References (ranked by relevance)
Revelation 19:9
50
And he saith unto me, Write, Blessed are they which are called unto the marriage supper of the Lamb. And he saith unto me, These are the true sayings of God.
Matthew 24:33
40
So likewise ye, when ye shall see all these things, know that it is near, even at the doors.
Luke 17:8
17
And will not rather say unto him, Make ready wherewith I may sup, and gird thyself, and serve me, till I have eaten and drunken; and afterward thou shalt eat and drink?