Yoga Sutras 1.24
Patanjali, explained by Swami Vivekananda
क्लेशकर्मविपाकाशयैरपरामृष्टः पुरुषविशेष ईश्वरः ॥
kleśakarmavipākāśayairaparāmṛṣṭaḥ puruṣaviśeṣa īśvaraḥ
Ishvara (the Supreme Ruler) is a special Purusha, untouched by misery, actions, their results, and desires.
In plain words: Ishvara, the Supreme Ruler, is a special soul (Purusha) who is never touched by suffering, by actions and their results, or by desires. The teacher explains that yoga speaks of God this way, not mainly as the creator of the world.
Swami Vivekananda explains
We must again remember that the Pātanjala Yoga philosophy is based upon the Sankhya philosophy; only in the latter there is no place for God, while with the Yogis God has a place. The Yogis, however, do not mention many ideas about God, such as creating. God as the Creator of the universe is not meant by the Ishvara of the Yogis. According to the Vedas, Ishvara is the Creator of the universe; because it is harmonious, it must be the manifestation of one will. The Yogis want to establish a God, but they arrive at Him in a peculiar fashion of their own. They say: