John Gill Commentary 1 Samuel 25:38

"And it came to pass about ten days after, that Jehovah smote Nabal, so that he died." — 1 Samuel 25:38 (ASV)

And it came to pass, about ten days [after] After he had lain in this stupid and senseless manner for ten days:

that the Lord smote Nabal, that he died; with some disease or increased the grief of his heart, and the fears of his mind that he died therewith.