According to the legend, in one night of July 15th (lunar year), Huyen Quang bonze and other Buddhist monks and nuns, after observing rituals, came back to their room. It was late at night. Everybody went to bed. In his dream, Huyen Quang saw a shining pearl on the side of mountain. When he bended out to clearly see the pearl, the pagoda's bell rang, making him wake up. The early morning came, all of monks and nuns went to the pagoda for chanting prayers.
When thinking over his dream in the night before, Huyen Quang and other bonzes went to the side of mountain to examine. After clearing trees, they found a well of wich water proved so sweet, fresh to make comfortable for everybody.
They came back to the pagoda did thanksgiving for this well and asked gods' permission for deepening, enlarging, and using stone brick to built the lip of this well. Since, the well has been calledGieng Ngoc (pearl well) and this wen's water is used for worship in the pagoda./.