一切經音義 18.38

18.38

雨大香雨（上雨字去聲于句反下雨字上聲于矩反說文雨字象形）。

Raining a great rain of incense (the upper character 'rain' (yu) is in the falling tone, [pronounced with the fanqie] 于 + 句; the lower character 'rain' (yu) is in the rising tone, [pronounced with the fanqie] 于 + 矩. The Shuowen jiezi says: 'The character yu (rain) is a pictograph').