Hebrews 11:8-12

By faith Abraham, when he was called, obeyed and set out for a place that he was going to receive as an inheritance. He went out, even though he did not know where he was going. By faith he stayed as a foreigner in the land of promise, living in tents as did Isaac and Jacob, coheirs of the same promise. For he was looking forward to the city that has foundations, whose architect and builder is God. By faith even Sarah herself, when she was unable to have children, received power to conceive offspring, even though she was past the age, since she considered that the one who had promised was faithful. Therefore, from one man — in fact, from one as good as dead — came offspring as numerous as the stars of the sky and as innumerable as the grains of sand along the seashore.