Hebrews 11:11-12

By faith even Sarah herself received the ability to conceive [a child], even [when she was long] past the normal age for it, because she considered Him who had given her the promise to be reliable and true [to His word]. [Gen 17:19; 18:11-14; 21:2] So from one man, though he was [physically] as good as dead, were born as many descendants AS THE STARS OF HEAVEN IN NUMBER, AND INNUMERABLE AS THE SAND ON THE SEASHORE. [Gen 15:5, 6; 22:17; 32:12]