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.
Romans 4:17-19
just as it is written [Gen. 17:5], "I [i.e., God] have made you [i.e., Abraham] forefather of many nations." He received this promise in the presence of God, in whom he believed, and who gives life [back] to dead people and who refers to things [promised] as though they were [already] fulfilled.
Romans 9:27
And Isaiah declares about [the nation of] Israel [Isa. 10:22-23], "[Even] if the number of Israelites were [as many] as the grains of sand in the ocean, [still only] a small minority will be saved.
Revelation 20:8
and he will [again] go out to deceive the nations which are [located] throughout the whole world --- Gog and Magog. [Note: Based on Eze. 35-40, it appears that these names are used here figuratively for all the forces of wickedness which are enemies of God]. Satan will assemble them together for battle, and they will be as numberless as the sand on the seashore.