Chapter 17 · The Three Kinds of Faith · Krishna said
Bhagavad Gita 17.6 — Torturing the body
कर्षयन्तः शरीरस्थं भूतग्राममचेतसः। मां चैवान्तःशरीरस्थं तान्विद्ध्यासुरनिश्चयान् ॥
karṣayantaḥ śarīrasthaṃ bhūtagrāmamacetasaḥ | māṃ caivāntaḥśarīrasthaṃ tānviddhyāsuraniścayān ||
Meaning
who foolishly torment the elements of their own body and Me who dwells within — know them to be of demonic resolve.