續一切經音義 3.39

3.39

寶繩（下食蠅反世本曰涶作準繩尚書曰繩𮘧糺謬格其非心也又曰木從繩則正說文索也從糸蠅省聲也）。

Precious plumb-line (寶繩: the second character has the fanqie 食蠅 [shi + ying / shéng]. The Shiben says: "Chui created the plumb-line." The Shangshu says: "Following the line to correct errors and rectify their deviant minds." It also says: "When timber follows the plumb-line, it becomes straight." The Shuowen says: "A cord; formed with 糸 [silk] as the radical and the abbreviated form of 蠅 as the phonetic component.")