Albert Barnes Commentary Numbers 26:11

"Notwithstanding, the sons of Korah died not." — Numbers 26:11 (ASV)

The children of Korah did not die – Compare Numbers 26:58. Samuel the prophet was of this family, and Heman, “the king’s seer” (1 Chronicles 6:22), 1 Chronicles 6:33; 1 Chronicles 25:5. Several of the Psalms appear from the titles to have been composed for the sons of Korah: compare titles of Psalms 42:1-11; Psalms 44; Psalms 45, etc.