Ba'al Shem Tov, Emor
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הבעל שם טוב היה מיקל בחדש, ופעם אחד נסע עם ר' יחיאל זצלה"ה כשנעשה רב בהוראדנא, וראה שמחמיר, התחיל גם הוא להחמיר: (מדרש פינחס החדש אות פ"ג).
Ami Silver, 2020
At first, the Baal Shem Tov was lenient about chadash. Once, though, he was traveling with Reb Yechiel, who had just been appointed rabbi of Horodnah, and saw that the latter was stringent in the matter, and he too began to be stringent. Midrash Pinchas HaChadash 83