《太平广记·卷十四·神仙十四》
老翁问张举是怎么回事，张举说： 你遇到的那两个人是仙馆丈夫，他们下棋时喝的是玉浆，你吃的井中黑泥就是龙穴石髓。
问张举，举曰： 此仙馆丈夫，所饮者玉浆，所食者龙穴石髓。
The old man asked Zhang Ju what was going on. Zhang Ju said, "The two people you met were husbands of celestial maidens. What they drank when they played chess was jade nectar, and the black mud you ate in the well was the marrow of dragon cave stone."