What did Ezra, Zerubbabel son of Shealtiel, and Jeshua son of Jehozadak, do? They gathered all the congregation to the Temple of the Lord, and they brought 800 priests, 800 children, and 800 scrolls of the Torah in their hands, and they blew (the trumpets), and the Levites sang songs and praises, and they excommunicated the Cutheans with the mystery of the Ineffable Name, and with the script such as was written upon the tables (of the Law), and by the ban of the heavenly Court of Justice, and by the ban of the earthly Court of Justice (decreeing) that no one of Israel should eat the bread of the Cutheans.
Hence (the sages) said: Everyone who eats the bread of the Cutheans is as though he had eaten of the flesh of swine. Let no man make a proselyte in Israel from among the Cutheans. They have no || portion in the resurrection of the dead, as it is said, "Ye have nothing to do with us to build an house unto our God" (Ezra 4:3), neither in this world, nor in the world to come. So that they should have neither portion nor inheritance in Israel, as it is said, "But ye have no portion, nor right, nor memorial, in Jerusalem" (Neh. 2:20).