15:3And Abram said, Behold, to me thou hast given no seed: and, lo, one born in my house is mine heir.

15:6And he believed in the LORD; and he counted it to him for righteousness.

17:17Then Abraham fell upon his face, and laughed, and said in his heart, Shall a child be born unto him that is an hundred years old? and shall Sarah, that is ninety years old, bear?