The Long Āgama Sūtra 5.28

5.28

「婆悉吒！剎利種中，有剃除鬚髮，法服修道，修七覺意，道成不久。所以者何？彼族姓子法服出家，修無上梵行，於現法中自身作證：『生死已盡，梵行已立，所作已辦，不復受有。』婆羅門、居士、首陀羅種中，有剃除鬚髮，法服修道，修七覺意，道成不久。所以者何？彼族姓子法服出家，修無上梵行，於現法中自身作證：『生死已盡，梵行已立，所作已辦，不復受有。』婆悉吒！此四種中皆出明行成就羅漢，於五種中為最第一。」

“Vāsiṣṭha, there are those in the warrior caste who some shave their hair and beard, wear the Dharma clothes, and cultivate the path. They cultivate the seven factors of awakening and soon achieve the path. Why is that? The sons of those clans leave home wearing Dharma clothes and cultivate the unsurpassed religious practice. In the present life, they realize for themselves, ‘Birth and death has been ended, the religious practice has been established, and the task has been accomplished. I’m no longer subject to existence.’ There are those in the priest, householder, and worker castes who shave their hair and beard, wear the Dharma clothes, and cultivate the path. They cultivate the seven factors of awakening and soon achieve the path. Why is that? The sons of those clans leave home wearing Dharma clothes and cultivate the unsurpassed religious practice. In the present life, they realize for themselves, ‘Birth and death has been ended, the religious practice has been established, and the task has been accomplished. I’m no longer subject to existence.’

“Vāsiṣṭha, there are those in these four castes who produce the accomplished wisdom and conduct of arhats, but those in the fifth caste are the best of them.”