From where do we know that one must be "dan" someone "l'caf zechut"? (that we must judge someone favorably even though from a certain act it might seem they are doing something?
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The Gemora (Shavuos 30a) derives from the verse (Vayikra 19:15) "בצדק תשפוט עמיתך" ("You shall judge your fellow with righteousness") that one should judge others favorably.
In Pirkei Avos 1:7: