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How could they offer Korbanos? After Yehoshua died, the Mishkan was established in Shilo, and Bamos were forbidden!
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R. Shimon (Zevachim 119a): "Ki Lo Vasem
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Meshech Chachmah: Similarly, after Pilegesh b'Giv'ah, they offered Korbanos in Beis Kel, for the Aron was there (20:26, 27).
