Revelation 21:12-14

12 It has a great, high wall with twelve gates, and at the gates twelve angels, and on the gates are inscribed the names of the twelve tribes of the Israelites;
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 has twelve foundations, and on them are the twelve names of the twelve apostles of the Lamb.
New Revised Standard Version Bible, copyright 1989, Division of Christian Education of the National Council of the Churches of Christ in the United States of America. Used by permission. All rights reserved.