Mat 22:3 And sent forth his servants to call them that were invited to the wedding: and they would not come.
Mat 22:4 Again, he sent forth other servants, saying, Tell them which are invited, Behold, I have prepared my dinner: my oxen and [my] fatlings [are] killed, and all things [are] ready: come to the marriage.

Th repeated trips by servants from the king represents a pattern in many of Christ's parables. The specific analogy here is of God sending prophets to Israel, with Israel in the role of the invited one. However, there is a larger idea here of God giving us all repeated opportunities to hear his message.

As we have noted in several parables, Christ's uses three types of symbols in his parables representing the physical, mental, and emotional realm by action, talk, and relationships respectively. Usually, each repeated step of the story symbolizes one of these three realms, often as cycles within cycles.

Here, the symbols are mixed together in each stage of the story. The wedding feast itself is symbolic of an emotional relationship, but so is the indifference of the guests and the anger of the king (in a latter verse). At each stage of the story a message is passed and decisions are made, representing the mental realm. Also, at each stage of the story, physical actions are taken--the meals prepared, the servants slain, and finally the invited guests slain.

In these two verses, the emphasis is on sending a message about the immediate physical benefits of the relationship, that is, the feast being offered.

"Prepare" is from hetoimazô , which means "to get ready," and "to prepare."

"Dinner" is from ariston, which originally meant "breakfast" but later meant "luncheon."