Bhishma said If, having practised the vow of Brahmacharya for the prescribed period (of twelve years) and acquired proficiency in the Vedas and their branches a Brahmana himself asks for the offerings made in Shraddhas and eats the same, he is considered to fall away from his vow. The Shraddha, however is not considered as sullied in any way.
भीष्म उवाच आदिष्टिनो ये राजेन्द्र ब्राह्मणा वेदपारगाः। भुञ्जते ब्रह्मकामाय व्रतलुप्ता भवन्ति ते॥