"It is only Elijah who will not arrive on Shabbat eve, but the Messiah himself may arrive, for once the Messiah comes, all the nations will be subservient to the Jewish people, and they will help them prepare whatever is needed for Shabbat." - Eruvin 43b
https://www.sefaria.org/Eruvin.43b.6
"A gentile who engages in Torah study is liable to receive the death penalty; as it is stated: “Moses commanded us a law [torah], an inheritance of the congregation of Jacob” (Deuteronomy 33:4), indicating that it is an inheritance for us, and not for them." -Sanhedrin 59a
https://www.sefaria.org/Sanhedrin.59a
"But one may not allow a gentile to circumcise a Jew in any situation, because gentiles are suspected of bloodshed." -Avodah Zarah 26b
https://www.sefaria.org/Avodah_Zarah.26b