Chapter 3 - Verse 40

इन्द्रियाणि मनो बुद्धिरस्याधिष्ठानमुच्यते ।
एतैर्विमोहयत्येष ज्ञानमावृत्य देहिनम् ॥ ४० ॥

indriyāṇi mano buddhirasyādhiṣṭhānamucyate .
etairvimohayatyeṣa jñānamāvṛtya dehinam .. 40 ..


The senses, mind, and reason are said to be its seat; veiling wisdom through these, it deludes the embodied.
Read the commentary
Its seat : the seat of desire. These : the senses mind (manas), and reason (buddhi).