Ezekiel 48:30-35

“And these are the exits of the city. On the north side. Four thousand five hundred in measurement. And the gates of the city will be in accordance with the names of the tribes of Israel. Three gates northward, the gate of Reuben, one, the gate of Judah, one, the gate of Levi, one. And at the east side. Four thousand five hundred in measurement, and three gates, even the gate of Joseph, one, the gate of Benjamin, one, the gate of Dan, one. And at the south side. Four thousand five hundred by measurement, and three gates, the gate of Simeon one, the gate of Issachar, one, the gate of Zebulun, one. At the west side. Four thousand five hundred, with their three gates, the gate of Gad, one, the gate of Asher, one, the gate of Naphtali, one. It shall be eighteen thousand round about.

The city is now described as containing all the original tribes of Israel, all on equality with each other, Levi one with the others. It summarises the whole people of God. Three to a side may represent foursquare completeness. The number of the elect is now complete. The numbers are multiples of three and five (3 times 3 times 5 times a hundred), a declaration of covenant completeness, and an intensified multiple of three (3 times 3 times 2 times a thousand) denoting total completeness.