Hebrews 11:12

Therefore, from one man [Abraham], who was as good as dead [i.e., because of having a sterile wife], were born descendants as numerous as the stars in the sky and as countless as the [grains of] sand on the seashore.

Revelation 7:9-10

After seeing [all] these things, I looked and there [I saw] a huge crowd, which no one could count, from every nation, and tribe, and race, and language group standing in front of the throne [of God] and in front of the Lamb. They were dressed in white robes and had palm tree 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
Therefore, from one man [Abraham], who was as good as dead [i.e., because of having a sterile wife], were born descendants as numerous as the stars in the sky and as countless as the [grains of] sand on the seashore.
Revelation 7:9
After seeing [all] these things, I looked and there [I saw] a huge crowd, which no one could count, from every nation, and tribe, and race, and language group standing in front of the throne [of God] and in front of the Lamb. They were dressed in white robes and had palm tree branches in their hands.