Parashas Mishpatim · Passuk 23:19
Chabad.org — English translation + Rashi
Torah Temimah points to Chullin 114a (verified).
Sefaria — Exodus 23:19Sefaria — Sanhedrin 4bE-Daf — Sanhedrin 4b
English: The Sages taught: I know the prohibition from its mother’s milk; from where do I know it applies to cow’s and sheep’s milk? The verse says, “in its mother’s milk.”
On the daf / in context: See the cited source for the full section.
Derash on the verse.