金光明最勝王經疏 4.443

4.443

經　「何以故？是鼓音聲，不從木生、不從皮生及桴手生、不於三世生，是則不生。」

Sūtra: "Why is that? This sound of the drum does not arise from the wood, does not arise from the leather, nor does it arise from the drumstick and hand, nor does it arise in the three times; thus it does not arise."