What does John 2:20 mean?
The temple was massive and beautiful. Solomon had built a gorgeous structure (1 Kings 6), which was unfortunately raided by the Egyptians a few decades later (2 Chronicles 12:1–5). Israel eventually rebuilt it, as described in the books of Ezra and Nehemiah. The Rome-appointed king, Herod, was upgrading this "second temple" at the time Jesus began His ministry. It was the center of Jewish worship, and entirely necessary for proper sacrifices to God. When asked to perform a miracle to justify His disruption of trade inside the temple grounds (John 2:13–18), Jesus claimed He can rebuild a destroyed temple in three days (John 2:19).In this gospel, "the Jews" are usually the scribes, Pharisees, and other religious leaders. They would have been offended at the idea that something so important could be so easily rebuilt. However, Jesus was predicting His own death and resurrection. This statement will be used against Jesus both during His trials (Matthew 26:61) and as heckling when He is crucified (Matthew 27:40). In AD 70, the Roman Empire would completely obliterate the temple and the Jewish sacrificial system would be erased (Mark 13:2; Hebrews 8:13).