Parashas Beshalach · Passuk 16:28
Chabad.org — English translation + Rashi
Torah Temimah points to Bava Kama 92b (verified).
Sefaria — Exodus 16:28
Sefaria — Yerushalmi Nedarim 3:9
English: “Until when will you refuse” — this is one of the ten trials with which our ancestors tested the Holy One, Blessed be He, in the wilderness.
On the daf / in context: See the cited source for the full section.
Derash on the verse.
The attempt to gather manna on the seventh day, despite the clear commandment, constitutes one of the ten trials of the wilderness generation.