Ba'al Shem Tov, Kuntres Meirat Einayim 64/בעל שם טוב על התורה·קונטרס מאירת עינים ס״ד

1The holy Rabbi Mordechai of Chernobyl said: “I believe that until the coming of the Redeemer – soon in our days – whenever a Jew sighs and his heart breaks with thoughts of repentance, it comes from the power of the Baal Shem Tov.Mefalos HaTzaddikim