Gita Mahatmya
Varāha Purāṇa, Gītā-māhātmya 4
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
गीतायाः पुस्तकं यत्र यत्र पाठः प्रवर्तते ।
तत्र सर्वाणि तीर्थानि प्रयागादीनि तत्र वै ॥gītāyāḥ pustakaṁ yatra yatra pāṭhaḥ pravartate
tatra sarvāṇi tīrthāni prayāgādīni tatra vaiWherever a Gītā book is kept and wherever the Gītā is read, all the holy places (tīrthas), like Prayāga, are present there.
Source: Varāha Purāṇa, Gītā-māhātmya 4