Ezekiel 40-42
The final nine chapters in the book of Ezekiel describe a vision given to the prophet, where God transports him to Jerusalem in Israel, and he is given a measuring stick to measure all kinds of different aspects of the temple and the city. This was clearly the measurements of the temple in the future, since the city and the temple had been destroyed by Nebuchadnezzar. All of this is generally thought to showed things in the Jerusalem and Temple of the Millennial reign of Jesus Christ, however most bible commentators consider these chapters to be among the most difficult to interpret in all of the Bible, and in some cases they do not even try.
In these three chapters Ezekiel measures the confines of the temple, which was divided into three major sections, with the Holy place center-most, surrounded by an inner court that measured around 150 feet square on each side, and an outer court and wall that measured around 750 feet square on each side.