Abraham brought Isaac to Mount Moriah to offer him as a sacrifice to the Lord.
The episode appears in Genesis 22 and is known in Jewish tradition as the Akedah, or Binding of Isaac. Abraham builds an altar, arranges the wood, and binds Isaac, but an angel stops him before the sacrifice is completed. A ram caught in a thicket is offered instead.
The biblical text first describes Moriah as a region containing a mountain God would identify. Later Jewish and Christian tradition connected this location with Mount Moriah in Jerusalem, traditionally associated with the Temple Mount. This is why “Mount Moriah” is the standard quiz answer, although Genesis itself does not provide the modern mountain’s precise coordinates.
A common mistake is saying Isaac was actually sacrificed. In the main Genesis narrative, he was not; the story ends with the ram substituted for him. Islamic tradition also differs about the identity of the son, generally identifying him as Ishmael rather than Isaac.