en_tn/act/22/19.md

Paul continues to speak.

they themselves know

The non-believing Jews at Jerusalem.

beat those

"Arranged to have them punished by a whipping"

every synagogue

Paul sought out any jewish believers who attended any synagogue around Jerusalem.

the blood of Stephen...was spilled

this is an expression for brutally beating a person until they are dead. (See: rc://en/ta/man/translate/figs-idiom)