金光明經玄義 1.27

1.27

問：若爾，樹王下丈六，既非佛復非鹿馬，為是何身？答：一往應同人像，此屬應身。又一解：例如大乘心中智合中理為法身。今亦如是，體是人像即是真空，此屬真身。

Question: If so, what body is the sixteen-foot body beneath the tree-king, since it is neither [this] Buddha nor deer and horses? Answer: For the moment, as it responds in conformity with the human form, it belongs to the response body. There is also another explanation: for example, within the Mahāyāna, when wisdom harmonizes with the middle principle, it constitutes the dharmakāya. Here it is likewise: its embodiment being a human form is identical with true emptiness; hence it belongs to the true body.