deva-dwija-guru-prājña- pūjanaṁ śhaucham ārjavam
brahmacharyam ahinsā cha śhārīraṁ tapa uchyate||14||

Meaning : Worshiping the gods, the twice-born (brahmanas), the teachers, and the wise; purity, honesty, celibacy, and non-violence these are called physical austerity (tapas)