Verse
देवद्विजगुरुप्राज्ञप् ऊजनं शौचमार्जवम् ।ब्रह्मचर्यमहिंसा च शारीरं तप उच्यते ॥
devadvijaguruprājñap ūjanaṃ śaucamārjavambrahmacaryamahiṃsā ca śārīraṃ tapa ucyate
Worship given to the godhead, to the twice-born, to the spiritual guide, to the wise, cleanness, candid dealing, sexual purity and avoidance of killing and injury to others, are called the askesis of the body.
Gītā 17·14