Mbh 8.45.1a

"'Karna continued, "Thou shouldst know all this, O Shalya. I shall however, again speak unto thee. Listen with close attention to what I say. Once on a time a Brahmana came to our house as a guest. Observing our practices he became highly gratified and said unto us, 'I dwelt for a long time on a peak of the Himavat quite alone. Since then I have seen diverse countries following diverse religions. Never, however, have I seen all the people of a country act unrighteously. All the races I have met will admit that to be true religion which has been declared by persons conversant with the Vedas. Travelling through various countries following various religions, I at last, O king, came among the Vahikas. There I heard that one at first becomes a Brahmana and then he becomes a Kshatriya. Indeed, a Vahika would, after that, become a Vaishya, and then a Shudra, and then a barber. Having become a barber, he would then again become a Brahmana. Returning to the status of a Brahmana, he would again become a slave. One person in a family becomes a Brahmana: all the others, falling off from virtue, act as they like. The Gandharas, the Madrakas, and the Vahikas of little understanding are even such. Having travelled through the whole world I heard of these practices, destructive of virtue, of these sinful irregularities amongst the Vahikas.' Thou shouldst know all this, O Shalya. I shall, however, again speak to thee about those ugly words that another said unto me regarding the Vahikas. In former days a chaste woman was abducted by robbers (hailing) from Aratta. Sinfully was she violated by them, upon which she cursed them, saying, 'Since ye have sinfully violated a helpless girl who am not without a husband, therefore, the women of your families shall all become unchaste. Ye lowest of men, never shall ye escape from the consequences of this dreadful sin.' It is for this, O Shalya, that the sisters' sons of the Arattas, and not their own sons, become their heirs.