The Long Āgama Sūtra 9.14

9.14

「諸比丘！如來說四正法，謂口四惡行：一者妄語，二者兩舌，三者惡口，四者綺語。復有四法，謂口四善行：一者實語，二者軟語，三者不綺語，四者不兩舌。

“Monks, the Tathāgata has taught four correct things, which are four verbal bad practices: First is false speech, second is duplicity, third is harsh speech, and fourth is frivolous speech.

“There are another four things, which are four verbal good practices: First is truthful speech, second is gentle speech, third is speech that isn’t frivolous, and fourth is speech that isn’t duplicitous.