瑜伽論記 5.189

5.189

於人趣中建立如來四眾者，一、最增上故，謂國王則剎帝利；二、世間福田故，謂婆羅門，以多淨行世許為福田；三、用財不由他，謂大長者四棄諸世財，謂諸沙門，此皆佛有名如來眾。

Establishing the four assemblies of the Tathāgata among the human realm: first, because they are the most sovereign, namely kings, who are kṣatriyas; second, because they are worldly fields of merit, namely brāhmaṇas, who on account of their many pure practices are acknowledged by the world as fields of merit; third, those whose use of wealth does not depend on others, namely great householders; fourth, those who have cast away all worldly wealth, namely śramaṇas. Because all these belong to the Buddha, they are called the assemblies of the Tathāgata.