תִּפְתַּח־אֶ֭רֶץ וַתִּבְלַ֣ע דָּתָ֑ן וַ֝תְּכַ֗ס עַל־עֲדַ֥ת אֲבִירָֽם׃
The earth opened and swallowed up Dathan, And covered the company of Abiram.
Rashi on Psalms
The earth opened up, etc. It appears that [the Psalmist] bestowed honor upon the sons of Korah [by refraining] from mentioning their father. He attributed the sin to Dathan and Abiram.