One of the greatest disciples of the holy Baal Shem Tov zt”l was the tzadik, Reb Leib Sarah’s [ben Sarah] zt”l (1730-1791), who was known to travel far and wide, sustaining and supporting hidden tzadikim and uncovering sparks of holiness in far-flung places. It is told that on one Motza’ei Shabbos, Reb Leib Sarah’s suddenly felt a Divine presence tugging at his conscience, urging him to travel to a far-off land, where an unusually bright spark of greatness was hidden and needed to be uncovered. Reb Leib, the great mystic in faraway Ukraine, perceived that in Hungary there existed an exalted soul that was waiting to be redeemed. Early the next morning, he set out on his holy calling, to locate and cultivate the hidden spark of k’dushah.