When Moses went to Mount Sinai to get the Torah, it is described as
עָלִיתָ לַמָּרוֹם, שָׁבִיתָ שֶּׁבִי
You went up and captured a captive
שֶּׁבִי
is Shimon Bar Yochai
Moses captured the soul of Shimon bat Yochai for his future incarnation.
Art: Moses with the Ten Commandments by Philippe de Champaigne
