God visited Sarah at the time He had promised, and she bare a son, who
was called Isaac. Abraham was then 100 years old, and Sarah was 90.
Some years after this it came to pass that God proved Abraham and said:
Take now thy son, Isaac, thine only son, whom thou lovest, and get thee
into the land of Moriah and offer him on one of the mountains which I
will tell thee of. Abraham rose early in the morning, saddled his ass,
took two of his young men with him and Isaac his son; and he clave the
wood for the burnt offering, and went unto the place of which God had
told him. On the third day Abraham lifted up his eyes and saw the place
afar off. He said then to his young men: Abide ye here, and I and the
lad will go yonder and worship. And he took the wood for the burnt
offering and laid it upon Isaac, and he took in his hand the fire and
the knife; and they went both of them together. Then Isaac said: Father,
here is wood and fire; but where is the lamb for a burnt offering?
Abraham answered: God will provide himself the lamb, my son. So they
went both of them together. When they came to the place, Abraham built
an altar, laid the wood in order, bound Isaac and laid him upon the
wood. And he stretched forth his hand and took the knife to slay his
son. Then the Lord called unto him out of heaven and said: Abraham,
Abraham! Lay not thy hand upon the lad, neither do thou anything unto
him; for now I know that thou fearest God, seeing thou hast not withheld
thy son, thine only son from me. Abraham lifted up his eyes, and saw a
ram behind him, caught in the thicket by his horns. And he took the ram
and offered him up for a burnt offering in the stead of his son.--God
called the second time out of heaven and said: Because thou hast done
this thing, and hast not withheld thy son, thine only son, from me, I
will exceedingly bless thee, and I will multiply thy seed as the stars
of the heaven, and as the sand which is upon the sea shore; and in thy
seed shall all the nations of the earth be blessed. So Abraham returned
unto his young men and went with them to his home. (Gen. 22:1-19.)