None other than. . .
Est 2:5 Now in Shushan the palace there was a certain Jew, whose name was Mordecai, the son of Jair, the son of Shimei, the son of Kish, a Benjamite;
I'm almost certainly out of my league here, but is not a person's Jewishness determined by his mother's descent, rather than his father's? Hence though descended in the father's line from Benjamin, if his mother descends from Judah, (which line is not given) does that not make him a Jew?
I've heard that also but there is no reference as to the mother of Mordecai and the scripture stated that;
"If Mordecai be of the seed of the Jews"
not
"If Mordecai be of the "egg" of the Jews"