Bhagavad Gita Chapter 13 Verse 20

Gita 13.20

कार्यकरणकतृर्त्वे, हेतुः, प्रकृतिः, उच्यते।
पुरुषः सुखदुःखानाम्, भोक्तृृत्वे, हेतुः, उच्यते।।20।।

Gita 13.20

Kaaryakarankartritve, hetuH, prkritiH, uchyate,
PurushH, sukhduHkhaanaam’, bhoktritve, hetuH, uchyate ||20||

Translation: (Kaaryakarankartritve) in the production of action and performance / cause and effect (hetuH) cause/means (prkritiH) Prakriti (uchyate) is said to be, and (PurushH) SatPurush (sukhduHkhaanaam’) of joys and sorrows (bhoktritve) because of making the embodied soul experience (hetuH) cause (uchyate) is said to be. (20)

Translation: Prakriti is said to be the cause of the production of action and performance, and SatPurush is said to be the cause of making the embodied soul experience the joys and sorrows. In Gita Gita Chapter 18 Verse 16, it is said that Supreme God, making all the living beings revolve like a machine according to the deeds, is situated in the heart of all the living beings. In Gita Chapter 15 Verse 17, it is said that Supreme God is someone other than the giver of the knowledge of Gita. That same Immortal God by entering into the three loks/worlds sustains everyone.