Pictures of the oneness of New Jerusalem include the one flock, the one new man, and the one Body. Another picture is in 1 Corinthians 10:16-17, “The bread which we break, is it not the fellowship of the body of Christ? Seeing that there is one bread, we who are many are one Body; for we all partake of the one bread.”
The breaking portrays the death of Christ and the partaking implies His resurrection. By His death and resurrection, we have all become one in Him. This is the oneness of His Body, of the one new man, and of New Jerusalem.
Partaking of the bread makes us one. This is not the physical bread on the table, which is only a symbol. Remember John 6:63, “It is the Spirit who gives life; the flesh profits nothing.” Jesus Christ is the real bread, the living bread, as testified in all of John 6. Today our eating/partaking must be by exercising our spirit to contact the Spirit.
The most solid way to partake is with the Word and Spirit together. Ephesians 6:17-18 encourages us to receive “the sword of the Spirit, which Spirit is the word of God, by means of all prayer and petition, praying at every time in spirit.”
The word in verse 17 is “the instant word spoken at the moment by the Spirit in any situation. The sword, the Spirit, and the word are one. When the constant word in the Bible becomes the instant word, that word is the Spirit as the sword that kills the enemy.*”
The spirit in verse 18 is “our regenerated spirit, indwelt by the Spirit of God. It may be considered the mingled spirit — the spirit that is our spirit mingled with God’s Spirit. In praying, the main faculty that we should use is this spirit.**”
Receiving the word in spirit energizes us to participate in the one Body as the foretaste of New Jerusalem.