G-d remembers Sarah and gives her and Abraham a son, who is named Isaac (Yitzchak) meaning "will laugh"; Abraham is 100 years old, and Sarah 90. Isaac is circumcised at the age of eight days.
Hagar and Ishmael are banished from Abraham's home and wander in the desert; G-d hears the cry of the dying lad and saves his life by showing his mother a well. The Philistine king Avimelech makes a treaty with Abraham at Be'er Sheva.
G-d commands Abraham to sacrifice his son on Mount Moriah (the Temple Mount) in Jerusalem. Isaac is bound and placed on the altar, and Abraham raises the knife to slaughter his son. A voice from heaven calls to stop him, saying it was a test; a ram, caught in the undergrowth by its horns, is offered in Isaac's place.
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