Shiva Purana
मदर्चाकर्म विज्ञेयं बाह्ये यागादिनोच्यते ॥ मदर्थे देहसंशोषस्तपः कृच्छ्रादि नो मतम् ॥ ५२ ॥
By Karman my worship shall be understood and’not such extraneous rites as sacrifice, etc. Tapas or penance is the withering of physical body for my sake and not the rites Kṛcchra, etc.
english translation
madarcAkarma vijJeyaM bAhye yAgAdinocyate ॥ madarthe dehasaMzoSastapaH kRcchrAdi no matam ॥ 52 ॥
hk transliteration by Sanscript