In 1 Corinthians 12, Paul compared the Church to a body. He wrote: "For just as the body is one and has many members, and all the members of the body, though many, are one body, so it is with Christ" (1 Corinthians 12:12). Paul developed this analogy extensively throughout the chapter, explaining that just as a human body has many parts (eyes, ears, hands, feet) that serve different functions yet all belong to one body, so the Church has many members with different spiritual gifts who all belong to one body in Christ.
Paul's key points in this analogy include: no member can say it does not belong to the body because it is different from another part (verse 15-16); the body cannot consist of only one part (verse 19); the parts that seem weaker are indispensable (verse 22); and when one part suffers, every part suffers with it (verse 26). This teaches that every believer has a valuable role in the Church, and unity does not require uniformity.
While Paul does describe the Church as a temple elsewhere (1 Corinthians 3:16-17, Ephesians 2:21), and Jesus used the vine metaphor (John 15), and Paul used the field metaphor (1 Corinthians 3:9), the specific and extended analogy in 1 Corinthians 12 is that of a body.