Natyashastra
आद्यं चतुर्थमन्त्यं च सप्तमं दशमं गुरु । लघु शेषं ध्रुवापादे चतुर्विंशतिके भवेत् ॥ १२६॥
The first, fourth, seventh, tenth, and last are heavy. The rest are light. This is in the case of the twenty-four-syllabled (composition).
english translation
AdyaM caturthamantyaM ca saptamaM dazamaM guru । laghu zeSaM dhruvApAde caturviMzatike bhavet ॥ 126॥
hk transliteration by Sanscript