Reference for Sanhedrin 170:21

ותיפוק ליה דליכא עימור כלל לא צריכא ישן דזגא עליה אשה דאוקמא באפי זיקא דרך עימור בכך או אין דרך עימור בכך מאי תיקו

If so, how can the [Baraitha] further state, But his ox is as one belonging to an Israelite?<span class="x" onmousemove="('comment',' I.e., if his ox gored or was gored, the same law applies to it as to one of Jewish ownership, whereas an ox of non-Jewish ownership is differently treated, v. B.K. 38a. This proves that the Cuthean is regarded as a real Jew. ');">²⁰</span>

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