The Baal Shem Tov and the professor

The holy Baal Shem Tov takes his talmidim on a journey. They stop at a spring on the way and then visit an old man who greets the Baal Shem Tov like a long-lost brother. Later, they travel to a city and spend Shabbos with a Jewish tailor and a local anti-semite. Many years later, the talmidim learn of the purpose of their journey.