It is the collective mass, the body of all believers in Jesus Christ as their Lord and Saviour!
Every Christian is a member of the Body of Christ, they became a member the moment they believed when the Holy Spirit baptized (fully immersed) them into this body:
1 Corinthians 12:12-14,25-27
For as the body is one, and hath many members, and all the members of that one body, being many, are one body: so also is Christ. [13] For by one Spirit are we all baptized into one body, whether we be Jews or Gentiles, whether we be bond or free; and have been all made to drink into one Spirit. [14] For the body is not one member, but many…[25] That there should be no schism in the body; but that the members should have the same care one for another. [26] And whether one member suffer, all the members suffer with it; or one member be honoured, all the members rejoice with it. [27] Now ye are the body of Christ, and members in particular.
The Body of Christ is the church, the church is a called out assembly of people. This body of believers has a head, who is Jesus Christ:
Colossians 1:13,17-18
[13] Who hath delivered us from the power of darkness, and hath translated us into the kingdom of his dear Son: …[17] And he is before all things, and by him all things consist. [18] And he is the head of the body, the church: who is the beginning, the firstborn from the dead; that in all things he might have the preeminence.
Ephesians 1:20-23
Which he wrought in Christ, when he raised him from the dead, and set him at his own right hand in the heavenly places , [21] Far above all principality, and power, and might, and dominion, and every name that is named, not only in this world, but also in that which is to come: [22] And hath put all things under his feet, and gave him to be the head over all things to the church, [23] Which is his body, the fulness of him that filleth all in all.
The headship of Christ over the Body is compared to a husband wife relationship, Christ is prophesied to be married to the church in the future, this relationship is said to be a mystery:
Ephesians 5:22-32
Wives, submit yourselves unto your own husbands, as unto the Lord. [23] For the husband is the head of the wife, even as Christ is the head of the church: and he is the saviour of the body. [24] Therefore as the church is subject unto Christ, so let the wives be to their own husbands in every thing. [25] Husbands, love your wives, even as Christ also loved the church, and gave himself for it; [26] That he might sanctify and cleanse it with the washing of water by the word, [27] That he might present it to himself a glorious church, not having spot, or wrinkle, or any such thing; but that it should be holy and without blemish. [28] So ought men to love their wives as their own bodies. He that loveth his wife loveth himself. [29] For no man ever yet hated his own flesh; but nourisheth and cherisheth it, even as the Lord the church: [30] For we are members of his body, of his flesh, and of his bones. [31] For this cause shall a man leave his father and mother, and shall be joined unto his wife, and they two shall be one flesh. [32] This is a great mystery: but I speak concerning Christ and the church.
Romans 7:4
Wherefore, my brethren, ye also are become dead to the law by the body of Christ; that ye should be married to another, even to him who is raised from the dead, that we should bring forth fruit unto God.
2 Corinthians 11:2
For I am jealous over you with godly jealousy: for I have espoused you to one husband, that I may present you as a chaste virgin to Christ.
Every member of the body of Christ on earth is God’s representative of Jesus Christ, when the world sees a Christian it should see Christ!
2 Corinthians 5:18-20
And all things are of God, who hath reconciled us to himself by Jesus Christ, and hath given to us the ministry of reconciliation; [19] To wit, that God was in Christ, reconciling the world unto himself, not imputing their trespasses unto them; and hath committed unto us the word of reconciliation. [20] Now then we are ambassadors for Christ, as though God did beseech you by us: we pray you in Christ’s stead, be ye reconciled to God.
