《水经注·卷四》
山南有占墓。墓地上柏树郁郁苍苍，在山上密密丛丛地生长着，俗称夷齐墓。
山南有古冢，陵柏蔚然，攒茂丘阜，俗谓之夷齐墓也。
There is a tomb on the south side of the mountain. Cypress trees grow densely on the land above the tomb, and it is common called Yizhi Tomb.