The text is so clear, there is no explanation by the author that Jesus was speaking about his body like in the gospel of John.
John 2:
18The Jews then responded to him, “What sign can you show us to prove your authority to do all this?”
19Jesus answered them, “Destroy this temple, and I will raise it again in three days.”
20They replied, “It has taken forty-six years to build this temple, and you are going to raise it in three days?”21But the temple he had spoken of was his body. 22After he was raised from the dead, his disciples recalled what he had said. Then they believed the scripture and the words that Jesus had spoken.