The Birkat haMinim (Hebrew ברכת המינים "Blessing on the heretics") is a Jewish curse on heretics (minim). Modern scholarship has generally evaluated that the Birkat haMinim probably did originally include Jewish Christians before Christianity became markedly a gentile religion. It is the 12th of the Eighteen Benedictions or Amidah.
According to the Babylonian Talmud Tractate Berakhot 28b–29a, Shmuel ha-Katan was responsible for the writing of the Birkat haMinim:
"Rabban Gamaliel said to the sages: Is there no one who knows how to compose a benediction against the minim? Samuel Ha-Qatan stood up and composed it."
The blessing exists in various forms. Two medieval Cairo Genizah copies include references to both minim and Notzrim ("Nazarenes", i.e. "Christians").
"For the apostates let there be no hope. And let the arrogant government be speedily uprooted in our days. Let the noẓerim and the minim be destroyed in a moment. And let them be blotted out of the Book of Life and not be inscribed together with the righteous. Blessed art thou, O Lord, who humblest the arrogant" (Schechter)."