Patanjali Yoga Sutra 2.32

Sanskrit Sutra

शौच-सन्तोष-तपःस्वाध्यायेश्वरप्रणिधानानि नियमाः॥३२॥

Swami Vivekananda's translation

Internal and external purification, contentment, mortification, study, and worship of God are the Niyamas.

Chapter link: Yoga Sutra Chapter 2