Gita Mahatmya
Gītā-māhātmya 5
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
भारतामृतसर्वस्वं विष्णोर्वक्त्राद्विनिःसृतम् ।
गीतागङ्गोदकं पीत्वा पुनर्जन्म न विद्यते ॥bhāratāmṛta-sarvasvaṁ
viṣṇu-vaktrād viniḥsṛtam
gītā-gaṅgodakaṁ pītvā
punar janma na vidyateIt is said that one who drinks the water of the Ganges certainly gets salvation, but what to speak of one who drinks the waters of Bhagavad-gītā? Gītā is the very nectar of the Mahābhārata spoken by Viṣṇu Himself, for Lord Kṛṣṇa is the original Viṣṇu. It is nectar emanating from the mouth of the Supreme Personality of Godhead, and the Ganges is said to be emanating from the lotus feet of the Lord. Of course there is no difference between the mouth and the feet of the Supreme Lord, but in our position we can appreciate that the Bhagavad-gītā is even more important than the Ganges.
Source: Gītā-māhātmya 5