Jñāneśvarī (commentary on the Bhagavadgītā) 4.152

4.152

yajñaśiṣṭāmṛtabhujo yānti brahma sanātanam
nāyaṃ loko 'sty ayajñasya kuto 'nyaḥ kurusattama
aiseṃ anādisiddha cokhaṭa |
jeṃ jñāna yajñāvaśiṣṭa |
teṃ sevitī brahmaniṣṭha |
brahmāhaṃmaṃtreṃ ||

Such pure, beginningless knowledge,
which remains as the remnant of sacrifice,
is consumed by those steadfast in Brahman
with the mantra ‘I am Brahman.’