Shiva Purana
यदूर्जितं च नित्यं च तद्धि पौरुषमुच्यते । यद्दुर्बलमनित्यं च तद्धि प्राकृतमुच्यते ४३ ।
That which is forceful and permanent is called Pauruṣa. That which is weak and temporary is called Prākṛta.
english translation
yadUrjitaM ca nityaM ca taddhi pauruSamucyate । yaddurbalamanityaM ca taddhi prAkRtamucyate 43 ।
hk transliteration by Sanscript