You must differentiate between the physical temple of Old Covenant Israel and the spiritual Temple of the New Covenant that is both the body and church of Christ. Why did Christ say the physical temple would be destroyed but be speaking of the temple as His body?
Matthew 21:12 (KJV) And Jesus went into the temple of God, and cast out all them that sold and bought in the temple, and overthrew the tables of the moneychangers, and the seats of them that sold doves,
Joh 2:19 Jesus answered and said unto them, Destroy this temple, and in three days I will raise it up.
Joh 2:20 Then said the Jews, Forty and six years was this temple in building, and wilt thou rear it up in three days?
Joh 2:21 But he spake of the temple of his body.