Hebrews 11:11-12

11By faith, even though Sarah herself was barren and he was too old, he received the ability to procreate, because he regarded the one who had given the promise to be trustworthy.

12So in fact children were fathered by one man – and this one as good as dead – like the number of stars in the sky and like the innumerable grains of sand on the seashore.