Yōga Sūtra 1.24

क्लेशकर्मविपाकाशयैरपरामृष्टः पुरुषविशेष ईश्वरः।

klēśakarmavipākāśayairaparāmr̥ṣṭaḥ puruṣaviśēṣa īśvaraḥ।

[क्लेश कर्म विपाक आशयैर् अपरामृष्टः पुरुष विशेष ईश्वरः।
klēśa = obstacles; karma = action; vipāka = fruition of (result of); āśayair = desires; aparāmr̥ṣṭaḥ = untouched; puruṣa = the being; viśēṣa = is the specialty; īśvaraḥ = of īśvaraḥ;]

Being untouched by obstacles, fruits of activities, and desires is the specialty of the being called īśvaraḥ.

The definition of īśvaraḥ is given here. He is a special being who is not touched by the obstacles, fruits of activities and desires.