It is true here as elsewhere that “the body is of Christ;” and that this is the body into which we are baptized, is positively stated in Galatians 3:27, where we read, For as many of you as have been baptized into Christ have put on Christ.
Thus we are taught that baptism is that by which we become Christ’s, and heirs according to the promise. It is that by which we get into Christ, who is the Door of salvation. Being baptized into His body is being joined to His church, for the church is the body of Christ."
E.J. Waggoner