Tzava'at HaRivash Chapter 50
Can copy this into an AI, or connect the whole library to your assistant. For deeper learning, you can directly use the original seforim, sites, and apps.
וגם לא יסתכל בפני ב"א אפילו כשמדבר עמהם אם מחשבותיהם אינם לבורא ית' תמיד דבוקה כי יהי' לו פגם בנפשו מחמת הסתכלותו.
The Way of The Baal Shem Tov. Adapted into English by Rabbi Amiram Markel and Yehudah Shimon Markel, 2020
When speaking with others, do not look at the face of anyone whose thoughts are not always bonded to HaShem, the Creator, blessed is he, for doing so can blemish the soul.
ובבני אדם כשירים שמחשבותיהם דבוקה בהבורא ית' יסתכל דוקא ויקנה קדושה בנפשו:
The Way of The Baal Shem Tov. Adapted into English by Rabbi Amiram Markel and Yehudah Shimon Markel, 2020
However, regarding the faces of those whose thoughts are always in a state of adhesion to HaShem, the Creator, blessed is He, make a point of looking at them and acquire holiness in your soul.