en_tn/act/26/04.md

all the Jews

This is a generalization. Possible meanings are 1) this refers to Jews in general who knew about Paul. AT: "the Jews" or 2) this refers to Pharisees who knew Paul. AT: "the Jewish leaders" (See: rc://en/ta/man/translate/figs-hyperbole)

in my own nation

Possible meanings are 1) among his own people, not necessarily in the geographical land of Israel or 2) in the land of Israel.

the strictest party of our religion

"a group within Judaism who live by very strict rules"