en_tn_condensed/mat/23/08.md

But you must not be called

This can be stated in active form. Alternate translation: "But you must not let anyone call you" (See: rc://en/ta/man/jit/figs-activepassive)

you

All occurrences of "you" are plural and refer to all of Jesus's followers. (See: rc://en/ta/man/jit/figs-you)

all of you are brothers

Here "brothers" means "fellow believers."