Brihat Parashara Hora Shastra
तन्मानां सप्तहृत्षष्टिरेकाद्येकोत्तरैर्हता । शमंबुगुशुचंरादिखेटानां क्रमतो द्विज ॥ १४॥
Naisargika Bal. Divide one Rupa by 7 and multiply the resultant product by 1 to 7 separately, which will indicate the Naisargika Bal, due to Śani, Mangal, Budh, Guru, Śukr, Candr and Sūrya, respectively.
english translation
tanmAnAM saptahRtSaSTirekAdyekottarairhatA । zamaMbuguzucaMrAdikheTAnAM kramato dvija ॥ 14॥
hk transliteration by Sanscript