Romans 4:16-18

That is why it all turns upon faith; it is to make it a matter of God's favor, so that the promise may hold good for all Abraham's descendants, not only those who are adherents of the Law, but also those who share the faith of Abraham. For he is the father of all of us;

Hebrews 11:12

And so from one man, for any prospect of descendants as good as dead, there sprang a people in number like the stars in the heavens or the countless sands on the seashore.

Revelation 7:9

After that I saw a great crowd which no one could count from every nation, tribe, people, and language, standing before the throne and before the Lamb, wearing white robes, with palm branches in their hands,

Treasury of Scripture Knowledge

Summary

And I will make thy seed as the dust of the earth: so that if a man can number the dust of the earth, then shall thy seed also be numbered.

Bible References

General references

Romans 4:16
That is why it all turns upon faith; it is to make it a matter of God's favor, so that the promise may hold good for all Abraham's descendants, not only those who are adherents of the Law, but also those who share the faith of Abraham. For he is the father of all of us;
Hebrews 11:12
And so from one man, for any prospect of descendants as good as dead, there sprang a people in number like the stars in the heavens or the countless sands on the seashore.
Revelation 7:9
After that I saw a great crowd which no one could count from every nation, tribe, people, and language, standing before the throne and before the Lamb, wearing white robes, with palm branches in their hands,