Ezekiel 40:35-38

Then the shining man brought me to the north gate and measured it, and it had the same dimensions as the others. Its guardrooms, pillars, and porches were of the same dimension as the others. The gateway had narrow windows all around. It was fifty cubits long and twenty-five cubits wide. Its porch faced the outer court, and there were eight steps leading up to it, and there were palm trees carved on its pillars on either side. In each of the inner gateways there was a chamber with a doorway by the porch, where they washed the burnt offerings.