Gita Mahatmya
Varāha Purāṇa, Gītā-māhātmya 10
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
योऽष्टादश जपेन्नित्यं नरो निश्चलमानसः ।
ज्ञानसिद्धिं स लभते ततो याति परं पदम् ॥yo’ṣṭādaśa japennityaṁ naro niścalamānasaḥ
jñānasiddhiṁ sa labhate tato yāti paraṁ padamA person with a steady mind who reads all eighteen chapters every day gets perfect knowledge and then reaches the supreme abode.
Source: Varāha Purāṇa, Gītā-māhātmya 10