The six ways of rebirth, see above, and the four holy ways of rebirth, the latter being respectively into the realms of śrāvakas, pratyekabuddhas, bodhisattvas, and Buddhas; the ten are known as the 十界.

A Dictionary of Chinese Buddhist Terms, William Edward Soothill and Lewis Hodous

六道四聖===（名數）十界中由第一地獄界至第六天界為六道。第七聲聞界，第八緣覺界，第九菩薩界，第十佛界為四聖。法華玄義二曰：「十界謂六道四聖也。」

丁福保《佛學大辭典》