Esther 9:26
Wherefore they called these days Purim after the name of Pur. Therefore for all the words of this letter, and of that which they had seen concerning this matter, and which had come unto them,
Cross-references
Esther 9:20
Historical context
Esther 9:20 records Mordecai's letters—the same correspondence that led to the naming of Purim in verse 26.
Numbers 16:40
Parallel
Numbers 16:40 establishes a memorial of Korah's rebellion—similar to Purim becoming a lasting memorial.