Sefer Chasidim Siman 79
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.
השמר לך אל תשב עם אדם שלא תלמוד ממנו טובה כי אוי לו ואוי לנפשו ועוד שתגרום שיחשדוך בדבר רע כי יאמרו לא על חנם הלך זה אצלו ובך יתלו כל מעשיו הרעים:
Medieval Jewish mysticism, translated by Sholom Alchanan Singer. Northbrook, Ill. Whitehall Co., 1971
Guard yourself, do not sit with a man from whom you cannot learn good, ¹ ed. Phillipawski, p. 15. for woe unto him and woe unto his soul.² Moreover, you will cause others to suspect you of some evil matter, for they will say, “Not without cause did he go to him,”³ and they will attribute to you all his evil deeds.
footnotes: ¹ Gabirol, Choice of Pearls, ² Sukkah 56b. ³ Baba Kamma 92b.