"I would love to see the moment in which the great treasure will be dug up and scream the truth at the world," he wrote. "May the treasure fall into good hands, may it last into better times, may it alarm and alert the world to what happened… in the 20th Century… May history be our witness."
David knew that he might have only hours, or minutes. German soldiers had arrived in the next street. Two weeks before, they had begun to drive the half-million Jewish men, women and children living in the ghetto into trains taking them to the new death camp at Treblinka.
On 2 August, 6,276 people had been taken. On 3 August, another 6,458 were seized.
Others were gathered. Hundreds of paintings, sketches, maps, tram tickets, recipes and even photographs secretly developed in the ghetto were carefully wrapped in paper and stored.
Unearthed from the archive
The man behind the Oyneg Shabbes was a historian and social activist, Emanuel Ringelblum.
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