The Last Supper, which took place hours before the Lord’s crucifixion—was a Seder (Passover observance). Previously, the feast’s symbols had only pointed back to the Hebrews’ redemption from Egypt. But that Thursday night, Jesus revealed the messianic significance of two symbols: bread and wine.
You have been saved out of the world and then sent back into the world to witness to the world, and that's the only business in the world you have in the world, till you're taken out of the world! How can you? By following these four rules.