Avatamsaka Sutra, Ten Grounds Chapter, Second Ground, covering following text paragraph:

"The offense of loose speech also causes living beings to fall into the three evil paths. If they are born among people, they have two kinds of retribution: one, people will not accept what they say; two, their spech will not be clearly understood."

In Chinese

"綺語之罪亦令眾生墮三惡道；

若生人中，得二種果報，一者言無人受，二者語不明了。"