Abraham and his son Isaac, and Isaac's son Jacob, and Jacob's son Joseph lived perhaps 2,000 years before the birth of Christ.
These are the earlist patriarchs (the
patriarch is the head of the tribe; both the temporal and the spiritual leader of his people) whose lives are described in the Old Testament.
The earliest Hebrews led wandering lives, living in tents and moving from place to place. When he was an old man,
Abraham was directed (by God) to lead his tribe across the desert into the fertile land of
Canaan, to found a new nation...
On his way to the place of sacrifice, Isaac wants to know where the lamb (a symbol of innocence) is that is being
offered? Abraham replies that God will himself provide the lamb to be offered;
Isaac seems satisfied with this answer, and questions no further.
An angel prevents the sacrifice from taking place. And substitutes a ram in place of the (innocent) lamb. Abraham has been tested, and he has not been found wanting.
Abraham - and his progeny - are blessed because he has obeyed the will of God.