辞亲出家，识心达本，解无为法，名曰沙门。
常行二百五十戒，进止清净，为四真道行，成阿罗汉。
阿罗汉者，能飞行变化，旷劫寿命，住动天地。
次为阿那含。
阿那含者，寿终灵神上十九天，证阿罗汉。次为斯陀含。
斯陀含者，一上一还，即得阿罗汉。次为须陀洹。
须陀洹者，七死七生，便证阿罗汉。
爱欲断者，如四肢断，不复用之。
— 释迦牟尼佛
《四十二章经》: 第一章
Those who personally take leave from the household life, to know the mind and reach the fundamental, to understand the unconditioned Dharma, are named as Śramaṇas. Constantly practising the two hundred and fifty precepts, with advancing and ending for purity, with the Four Noble Truths’ path practising, accomplishing as Arhats. Those Arhats, are able to fly and transform, with distant kalpas’ lifespans, dwelling in and moving between the heavens and earth. Second to them are Anāgāmis. Those Anāgāmis, when their lifespans’ end, their consciousnesses will rise to the nineteenth heaven, to realise Arhathood. Second to them are Sakṛdāgāmins. Those Sakṛdāgāmins, are with one time once returning, to then attain Arhathood. Second to them are Srotaāpannas. Those Srotaāpannas, are with seven deaths and seven births, then realising Arhathood. Those with attachments and desires severed, are like those with their four limbs severed, not again using them.
— Śākyamuni Buddha
(Sūtra Of 42 Sections: 1st Section)
