續一切經音義 4.117

4.117

鈴鐸（上郎丁反切韻鈴似鍾而小下徒洛反釋名云鐸度也謂号令之限度也謂金鈴鐵舌振以用武金鈴木舌振以興文教令案振以警悟群生表傳法語也）。

Bells and clappers (lingduo 鈴鐸: the first character has the fanqie [reading] lang + ding [ling]. The Qieyun says: "A bell resembles a zhong bell but is smaller." The second character has the fanqie [reading] tu + luo [duo]. The Shiming says: "鐸 (duo) means 度 (measure), referring to the limits and regulations of orders and commands." That is, a metal bell with an iron clapper was shaken to conduct military affairs; a metal bell with a wooden clapper was shaken to promote civil administration and teachings. We note that it is rung to awaken sentient beings and represents the transmission of the words of the Dharma).