Midrash su Neemia 2:20

What did Ezra, Zerubbabel, and Jeshua do? First, they summoned the entire community to the House of the Lord. They brought there three hundred priests, three hundred books of the law, three hundred shofars, and three hundred children. The children blew the shofars, and the Levites chanted and sang. After that, they proclaimed the ban, the curse, and the excommunication against the Samaritans with the secret of the ineffable Name and the writing used on the tablets (of the Decalogue), and the excommunication of the heavenly and earthly courts, so that no Israelite would henceforth eat the bread of a Cuthite. As a result of this episode, our sages said that anyone who ate the bread of a Cuthite would be considered as eating the meat of a pig, and that no Cuthite could be admitted into the ranks of Israel, nor could they participate in the resurrection of the dead, as it is said: It is not for you, but for us, to build the house of God (Ezra 4:3), And ye have no portion, no right, no memorial in Jerusalem (Neh. 2:20). They wrote out the ban, sealed it, and sent it to the Israelites who were in Babylon, and these added other decrees against them. King Cyrus also established an everlasting ban against them, as it is said: May the God who has caused His name to dwell there overthrow all kings and peoples that shall put forth their hand to alter the same (Ezra 6:12).

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).