From p.161 of Emma Fattorini's Hitler, Mussolini and the Vatican:
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In the experience of Italian Jєωs, as indeed in the books and films that have recalled that dark moment in Italian history, the most agonising memory is that of Jєωιѕн students banished from public elementary and secondary schools just as they were about to return for the new academic year. This wound on national memory has a precise date - 5 September 1938 - when, at the end of the summer vacation, the regime issued a decree entitled "Measures for the defense of the race in fascist schools."
The day after the racist decree, 6 September, the pope pronounced what may have been his clearest statement on anti-Semitism. With a trembling voice, he spoke to pilgrims from Belgian Catholic Radio on the sacrifice of Abraham; at the invitation of the pope himself, Monsignor Picard, president of the radio, carefully transcribed the discourse:
At this point the pope could no longer control his emotions... and it was with tears in his eyes that he cited the passages from Saint Paul that describe our spiritual descent from Abraham... 'Listen carefully: Abraham is our patriarch, our ancestor. Anti-Semitism is not compatible with the sublime thought and reality evoked by this text. Anti-Semitism is a hateful movement with which we as Christians must have no involvement... Through Christ and in Christ we are the spiritual descendents of Abraham... every time I read the words "the sacrifice of our father Abraham," I cannot help but be profoundly moved. Christians are not permitted to take part in anti-Semitism. We recognise that everyone has a right to self-defence and can undertake those actions necessary to protect his legitimate interests. But anti-Semitism is inadmissible. Spiritually we are all Semites.'