Meeting Junkie (No More),
One likely reference of that saying is the so-called "eschatological banquet" which was a common representation of future bliss (in both heavenly and earthly traits, cf. Isaiah 25 etc.) in the "age to come". This is referred to in the NT, e.g.
Matthew 8:11f: "I tell you, many will come from east and west and will eat with Abraham and Isaac and Jacob in the kingdom of heaven" (cf. also the parable of the banquet in chapter 22).
Luke 22:30: "so that you may eat and drink at my table in my kingdom, and you will sit on thrones judging the twelve tribes of Israel."
Revelation 3:20: "Listen! I am standing at the door, knocking; if you hear my voice and open the door, I will come in to you and eat with you, and you with me." (Cf. 19:9.)
In a sense, the "last meal" itself is largely conceived after the image of that banquet, as its prolepsis or prefiguration.