Revelation 7:4-8

And I heard the number of those that were sealed: one hundred and forty-four thousand, who were sealed out of every tribe of the children of Israel.

Revelation 21:14

And the wall of the city had twelve foundations; and on them the names of the twelve Apostles of the Lamb.

Treasury of Scripture Knowledge

Summary

And it came to pass, when Israel dwelt in that land, that Reuben went and lay with Bilhah his father's concubine: and Israel heard it. Now the sons of Jacob were twelve:

Bible References

Now the sons

Revelation 7:4
And I heard the number of those that were sealed: one hundred and forty-four thousand, who were sealed out of every tribe of the children of Israel.
Revelation 21:14
And the wall of the city had twelve foundations; and on them the names of the twelve Apostles of the Lamb.