Parashas Shemos · Passuk 4:31
Chabad.org — English translation + Rashi
Torah Temimah points to Shabbos 97a (verified).
Sefaria — Exodus 4:31
Sefaria — Shabbos 97a
E-Daf — Shabbos 97a
English: “Reish Lakish said: One who suspects the worthy is punished in his own body. Moses said, “They will not believe me,” but God knew that Israel were believers; they are “believers, children of believers,” as it says, “And the people believed.””
On the daf / in context: See the cited source for the full section.
Talmudic ethical interpretation of Moses’s suspicion of Israel
Chazal read Moses’s hesitation as a lesson in judging Israel favorably: Israel’s belief is presented as a standing virtue, while suspicion of the worthy carries consequences.