Parashas Shemos · Passuk 2:13
Chabad.org — English translation + Rashi
Torah Temimah points to Nedarim 64b (verified).
Sefaria — Exodus 2:13
Sefaria — Nedarim 64b
E-Daf — Nedarim 64b
English: “Hebrews quarreling (nitzim)” — R’ Yochanan said in the name of R’ Shimon ben Yochai: Wherever the language nitzim or nitzavim appears, it refers only to Dasan and Aviram.
On the daf / in context: See the cited source for the full section.
Custom
Chazal identify the two quarreling Hebrews as Dasan and Aviram, the same men who would later oppose Moshe.