Revelation 21:9-14 regarding the Heavenly Jerusalem:

12 And had a wall great and high, and had twelve gates, and at the gates twelve angels, and names written thereon, which are the names of the twelve tribes of the children of Israel:

13 On the east three gates; on the north three gates; on the south three gates; and on the west three gates.

14 And the wall of the city had twelve foundations, and in them the names of the twelve apostles of the Lamb.