Tosefta su Geremia 33:78

[A person] who circumcises converts [to Judaism for their conversion] says [the following Beracha (blessing): Baruch Ata Hashem Eloheinu Melech Haolam Asher Kideshanu] Bemitzvotav Vetzivanu {Al Hamilah (Blessed are You Hashem, our God, King of the world, Who has sanctified us with His commandments and has commanded us regarding the circumcision). [The person] who says the Beracha [over the ceremony of the circumcision of converts] says [the following Beracha:] Baruch Ata Hashem Eloheinu Melech Haolam Asher Kideshanu] Bemitzvotav Vetzivanu} Lamul Et Hagerim {U}Lehatif Mehen Dam Brit Sheilmaleh Dam Brit Lo Nitkayem Shamayim Vaaretz Sheneemar Im Lo Briti Yomam Valailah [Chukot Shamaim Vaaretz Lo Samti]. Baruch [Ata Hashem] Koret Habrit (Blessed are You Hashem, our God, King of the world, Who has sanctified us with His commandments and has commanded us to circumcise converts and to draw from them the blood of the covenant, because if not for the blood of the covenant heaven and earth would not exist as it is said, “If not for My covenant day and night I would not upkeep the laws of heaven and earth.” (Jeremiah 33:25) Blessed are You Hashem, Who establishes the covenant). [A person] who circumcises slaves [when they get bought by a Jew] says [the following Beracha:] Baruch [Ata Hashem Eloheinu Melech Haolam Asher Kideshanu Bemitzvotav Vetzivanu] Al Hamilah (Blessed are You Hashem, our God, King of the world, Who has sanctified us with His commandments and has commanded us regarding the circumcision). [The person] who says the Beracha [over the ceremony of the circumcision of slaves] says [the following Beracha:] Baruch Ata Hashem Eloheinu Melech Haolam Asher Kideshanu] Bemitzvotav Vetzivanu Lamol Et Haavadim {U}Lehatif Mehen Dam Brit Sheilmaleh Dam Brit Lo Nitkayem Shamayim Vaaretz Sheneemar Im Lo Briti Yomam Valailah [Chukot Shamaim Vaaretz Lo Samti]. Baruch [Ata Hashem] Koret Habrit (Blessed are You Hashem, our God, King of the world, Who has sanctified us with His commandments and has commanded us to circumcise slaves and to draw from them the blood of the covenant, because if not for the blood of the covenant heaven and earth would not exist as it is said, “If not for My covenant day and night I would not upkeep the laws of heaven and earth.” (Jeremiah 33:25) Blessed are You Hashem, Who establishes the covenant).