Revelation 7:5

Overview - Revelation 7
1	An angel seals the servants of God in their foreheads.
4	The number of them that were sealed: of the tribes of Israel a certain number.
9	Of all the other nations an innumerable multitude, which stand before the throne, clad in white robes, and palms in their hands.
14	Their robes were washed in the blood of the Lamb.

Revelation 7:5  (King James Version)
Of the tribe of Juda were sealed twelve thousand. Of the tribe of Reuben were sealed twelve thousand. Of the tribe of Gad were sealed twelve thousand.