John Gill Commentary 1 Chronicles 2:30

"And the sons of Nadab: Seled, and Appaim; but Seled died without children." — 1 Chronicles 2:30 (ASV)

And the sons of Nadab
The eldest son of Shammai, (1 Chronicles 2:28) ,

Seled and Appaim; but Seled died without children ;
and therefore we hear no more of him.