Gita Mahatmya
Varāha Purāṇa, Gītā-māhātmya 6
These verses glorify the Bhagavad-gītā. They come from other scriptures and are not verses of the Bhagavad-gītā itself. Each one carries its own source.
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Gītā-māhātmya
यत्र गीताविचारश्च पठनं पाठनं श्रुतम् ।
तत्राहं निश्चितं पृथ्वि निवसामि सदैव हि ॥yatra gītāvicāraśca paṭhanaṁ pāṭhanaṁ śrutam
tatrāhaṁ niścitaṁ pṛthvi nivasāmi sadaiva hiO Earth, wherever the Gītā is discussed, read, taught or heard, I (Lord Viṣṇu) always live there.
Source: Varāha Purāṇa, Gītā-māhātmya 6