RobH_en_tn/jhn/07/35.md

The Jews therefore said among themselves

The "Jews" is a synecdoche that represents the leaders of the Jews who opposed Jesus. Alternate translation: "The Jewish leaders said among themselves" (See: rc://en/ta/man/translate/figs-synecdoche)

the dispersion

This refers to the Jews that were spread all across the Greek world, outside of Palestine.