What is the source of the allusion in the sentence below?
When the vase broke, my notoriously clumsy younger brother served as the scapegoat.

 - British history
 - the Bible
The source of the allusion scapegoat is the Bible.
The Bible's book of Leviticus describes a tradition of sacrificing an innocent goat to atone for humanity's sins.
The allusion scapegoat means a person who is unjustly blamed.