If one who is a Kshatriya or Vaishya performs those duties which are assigned to the Brahmana, after the manner of a Brahmana, he becomes a Brahman.
स्थितो ब्राह्मणधर्मेण ब्राह्मण्यमुपजीवति। क्षत्रियो वाथ वैश्यो वा ब्रह्मभूयं स गच्छति॥