en_tn/2sa/23/19.md

Was he not even more famous than the three?

This question is used to emphasize how famous he was. This rhetorical question can be translated as a statement. AT: "He was even more famous than the three." (See: rc://en/ta/man/translate/figs-rquestion)

three most famous soldiers

This refers to Josheb Basshebeth, Eleazar, and Shimeah. Abishai was not as famous as these soldiers.