Natyashastra
प्रस्ताव्यैवं तु निष्क्रामेत्काव्यप्रस्तावकस्ततः । एवमेष प्रयोक्तव्यः पूर्वरङ्गो यथाविधि ॥ १६९॥
Thus, after the introduction, the poet should exit. This is how the prologue should be performed, according to the prescribed method.
english translation
prastAvyaivaM tu niSkrAmetkAvyaprastAvakastataH । evameSa prayoktavyaH pUrvaraGgo yathAvidhi ॥ 169॥
hk transliteration by Sanscript