《北史·列传·卷二十三》
还有，陈留的老子祠中有一株干枯的柏树，老子将脱离尘世时说： 等枯柏树东南长出新枝，再回指时，当有圣人出世，我的道也就可以再行于世了。 
又陈留老子祠有枯柏，世传云老子将度世，云： 待枯柏生东南枝，回指，当有圣人出，吾道复行。 
Moreover, in the Laohu Temple in Chuliu there was a dead cypress tree. When Laohu was about to leave the mortal world, he said, “Wait until new branches sprout from the southwest of the dead cypress, and when they point back to it, a sage will be born and my teachings can again prevail in the world.”