Bhagwad Gita
Chapter 17, Verse 14
देवद्विजगुरुप्राज्ञपूजनं शौचमार्जवम्।ब्रह्मचर्यमहिंसा च शारीरं तप उच्यते।।17.14।।
The austerity of the body consists in this: worship of the Supreme Lord, the brahmanas, the spiritual master, and superiors like the father and mother. Cleanliness, simplicity, celibacy and nonviolence are also austerities of the body.