Dave grew up in the rural town of Dej, in Romania's Transylvania region.
Hitler gave Transylvania to Hungary in 1940, putting Dej's Jews on a path leading to their eventual deportation to concentration camp. Dave was shipped to KZ Auschwitz on June 6, 1944. One week later he arrived in KZ Mauthausen.
Dave was liberated on May 6, 1945. After spending 18 months in a hospital recovering from his ordeal, he first went back to his hometown of Dej, and then moved to Israel one year later.