Sefer Chasidim Siman 643
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.
אדם תפש את חבירו בקהל ואמר לו למה דברת עלי דברים שלא ראית ואמרת כי חברתי עם רשעים והלכתי עמהם ושחקתי עמהם השיב לו הרי אתה בעצמך מעיד על מעשיך ועל מחשבותיך:
Medieval Jewish mysticism, translated by Sholom Alchanan Singer. Northbrook, Ill. Whitehall Co., 1971
There was a certain person who set up a claim against his fellow and said to him "Why did you say things about me that you didn't see, and also you said that I hang around with evil people and I did go with them and laughed with them...?'' The other one replied: "Now you have just testified against yourself concerning your deeds and thoughts."