Natyashastra
एवमेष प्रयोक्तव्यः पूर्वरङ्गो यथाविधि । चतुरश्रो द्विजश्रेष्ठास्त्र्यश्रं चापि निबोधत ॥ १३७॥
Thus, this should be performed, just as the previous stage was, according to the prescribed method. The four-syllabled, the best of Brahmins, and the three-syllable should also be known.
english translation
evameSa prayoktavyaH pUrvaraGgo yathAvidhi । caturazro dvijazreSThAstryazraM cApi nibodhata ॥ 137॥
hk transliteration by Sanscript