Gita Mahatmya
Varāha Purāṇa, Gītā-māhātmya 11
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
पाठेऽसमर्थः संपूर्णे ततोऽर्धं पाठमाचरेत् ।
तदा गोदानजं पुण्यं लभते नात्र संशयः ॥pāṭhe’samarthaḥ saṁpūrṇe tato’rdhaṁ pāṭhamācaret
tadā godānajaṁ puṇyaṁ labhate nātra saṁśayaḥIf someone cannot read the whole Gītā, he should read half. He then gets the puṇya (merit) of giving a cow in charity. There is no doubt about this.
Source: Varāha Purāṇa, Gītā-māhātmya 11