Mordochai, thanks for catching that. This number is used twice by Josephus. Once in the War of the Jews 20.6
1 . . . there were more than eight thousand of the Jews at Rome who supported them
Antiquities of the Jews 18.2
(17) Now the number of the ambassadors that were sent by the authority of the nation were fifty, to which they joined above eight thousand of the Jews that were at Rome already.


סופי

And everything that Sarah tells you, listen to her voice. Bereshit (Genesis) 21:12