Patanjali laid out yoga’s ethical guidelines in his Yoga Sūtras
yamas (social ethics)
- ahimsa (non-harming)
 - satya (truthfulness)
 - asteya (non-stealing)
 - brahmacharya (moderation)
 - aparigraha (non-grasping)
 
niyyamas (personal observances)
- saucha (purity)
 - santosha (contentment)
 - tapas (self-discipline)
 - svadhyaya (self-study)
 - Ishvara pranidhana (surrender)