Mbh 13.49.13

"'Bhishma said, "The rites of purification touching such a son should be performed conformably to the usage of the person himself that raises him, for, cast off by his parents, such a son obtains the order of the person that takes him and brings him up. Indeed, O thou of unfading glory, the rearer should perform all the purificatory rites with respect to such a son according to the practices of the rearer's own race and kinsmen. As regards the girl also, O Yudhishthira, that should be bestowed in marriage upon such a son, who belongs to the order of the rearer himself, all this is to be done only when the order of son's true mother cannot be ascertained. Among sons, he that is born of a maiden and he that is born of a mother that had conceived before her marriage but had brought him forth subsequent to that are regarded as very disgraceful and degraded. Even those two, however, should receive the same rites of purification that are laid down for the sons begotten by the father in lawful wedlock. With respect to the son that becomes his sire's in consequence of his birth in the sire's soil and of those sons that are called Apasadas and those conceived by the spouse in her maidenhood but brought forth after marriage, Brahmanas and others should apply the same rites of purification that hold good for their own orders. These are the conclusions that are to be found in the scriptures with respect to the different orders. I have thus told thee everything appertaining to thy questions. What else dost thou wish to hear?"'"