In the Assalāyana Sutta (MN.ii.149) it is stated that in Yona and in Kamboja, and also in the neighbouring countries, there were, in the Buddha’s time, only two classes of people, masters and slaves, and that a master could become a slave or vice versa. Elsewhere Kamboja is mentioned as a place not visited by women of other countries. (AN.ii.82)
PTS book/page AN ii 82 = AN 4.80
MN ii 149 =
MN 93 ..."Even though Master Gotama says that, still the brahmans think, 'Brahmans are the superior caste... the sons & offspring of Brahma: born of his mouth, born of Brahma, created by Brahma, heirs of Brahma.'"
"What do you think, Assalayana? Have you heard that in Yana & Kamboja and other outlying countries there are only two castes — masters & slaves — and that having been a master one (can) become a slave, and that having been a slave one (can) become a master?"
"Yes, Master Gotama..."
"So what strength is there, Assalayana, what assurance, when the brahmans say, 'Brahmans are the superior caste... the sons & offspring of Brahma: born of his mouth, born of Brahma, created by Brahma, heirs of Brahma'?"
"Even though Master Gotama says that, still the brahmans think, 'Brahmans are the superior caste... the sons & offspring of Brahma: born of his mouth, born of Brahma, created by Brahma, heirs of Brahma.'"
"What do you think, Assalayana? Is it only a noble warrior who — taking life, stealing, engaging in sexual misconduct, telling lies, speaking divisively, speaking harshly, engaging in idle chatter, greedy, bearing thoughts of ill will, and holding wrong views — on the break-up of the body, after death, reappears in the plane of deprivation, the bad destination, the lower realms, in hell, and not a brahman? Is it only a merchant...? Is it only a worker who — taking life, stealing, engaging in sexual misconduct, telling lies, speaking divisively, speaking harshly, engaging in idle chatter, greedy, bearing thoughts of ill will, and holding wrong views — on the break-up of the body, after death, reappears in the plane of deprivation, the bad destination, the lower realms, in hell, and not a brahman?"
"No, Master Gotama. Even a noble warrior... Even a brahman... Even a merchant... Even a worker... (Members of) all four castes — if they take life, steal, engage in sexual misconduct, tell lies, speak divisively, speak harshly, engage in idle chatter, are greedy, bear thoughts of ill will, & hold wrong views — on the break-up of the body, after death, reappear in the plane of deprivation, the bad destination, the lower realms, in hell."...