The Gemara relates the story of NikanorÕs journey with these doors from Alexandria to the land of Israel. A storm broke out which endangered the ship, and there was no choice but to cast away one of the doors. When the people on the ship saw that the storm was not subsiding, they decided to throw the second door off as well. When Nikanor saw this, he held onto the door and said: "I am not parting with this door. You will have to throw me off with it." The sea immediately became quiet. When the ship reached the port of Acre, they were amazed to see the first door floating miraculously alongside the ship. (Source: Yoma 18).  Dimensions
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