Bhagavad Gita 17.6
कर्षयन्तः शरीरस्थं भूतग्राममचेतसः। मां चैवान्तःशरीरस्थं तान्विद्ध्यासुरनिश्चयान्।।17.6।।
karṣayantaḥ śarīrasthaṃ bhūtagrāmamacetasaḥ| māṃ caivāntaḥśarīrasthaṃ tānviddhyāsuraniścayān||17.6||
karshayantah sharirastham bhutagramamacetasah mam caivantahsharirastham tanviddhyasuranishcayan17.6
Meaning
...torturing the elements in their body and also the Supreme dwelling within — know such people to be of demonic resolve. Self-torture is not true spirituality.
और शरीरस्थ भूतसमुदाय को तथा मुझ अन्तर्यामी को भी कृश करने वाले अर्थात् कष्ट पहुँचाने वाले जो अविवेकी लोग हैं, उन्हें तुम आसुरी निश्चय वाले जानो।
This is verse 6 of 28 in Chapter 17 (Shraddhatraya Vibhaga Yoga) of the Bhagavad Gita.