Shiva Purana
शरीरादग्निनिर्माणं तत्तापभयवर्जनम् ॥ शक्तिर्जगदिदं दग्धुं यदीच्छेदप्रयत्नतः ॥ २४ ॥
It creates fire from the body and avoids the fear of suffering. If you try to cut it off, you have the power to burn this world to the ground.
english translation
zarIrAdagninirmANaM tattApabhayavarjanam ॥ zaktirjagadidaM dagdhuM yadIcchedaprayatnataH ॥ 24 ॥
hk transliteration by Sanscript