“Take your son—Isaac—and go to the region of Moriah. Sacrifice him there.” (22:2)
Abraham left with Isaac and two servants.
Angel: Do not lay your hand on the boy.
They arrived in Moriah the place were God told him to sacrifice his son. Abraham leaves his servants and walks up the hill to sacrifice Isaac
Since Abraham proved his loyalty to God. God provides a ram for him to sacrifice instead of his son. And makes a covenant with Abraham saying he will have a lot of offspring and they will bless the earth.