Hebrews 11:12

and thus there sprang from one man, and him practically dead, a nation like the stars in the heavens in multitude, or grains of sand upon the seashore, innumerable.

Revelation 7:9-10

After this I looked, and behold a great multitude, whom no man could number, out of every nation and tribe and people and tongue, standing before the throne and before the Lamb, clothed in white robes, with palm branches in their hands;

Treasury of Scripture Knowledge

Summary

As the host of heaven cannot be numbered, neither the sand of the sea measured: so will I multiply the seed of David my servant, and the Levites that minister unto me.

Bible References

The host

Hebrews 11:12
and thus there sprang from one man, and him practically dead, a nation like the stars in the heavens in multitude, or grains of sand upon the seashore, innumerable.
Revelation 7:9
After this I looked, and behold a great multitude, whom no man could number, out of every nation and tribe and people and tongue, standing before the throne and before the Lamb, clothed in white robes, with palm branches in their hands;