金光明最勝王經疏 2.189

2.189

贊曰：法合。彼等有為，設可轉變，故云或容，容彼不定。如來法身，必無生滅留骨舍利。若報化身，義準可知。

Commentary: Application of the analogy to the doctrine. Even if those conditioned things could perhaps be transformed—hence it says "could perhaps", allowing for their indeterminacy—the Tathāgata's dharmakāya certainly has no arising or ceasing that would leave behind bone relics. The Reward and Transformation bodies may be understood accordingly by analogy.