Bhishma said The rites of purification for such a son should be performed according to the usage of the person himself who rears him, for, renounced by his parents, such son gets the caste of the person who takes him and rears him.
भीष्म उवाच आत्मवत् तस्य कुर्वीत संस्कारं स्वामिवत् तथा। त्यक्तो मातापितृभ्यां यः सवर्ण प्रतिपद्यते॥