Manava Dharmashastra 6.83

6.83

japamātramasyābhyanujñāyate, na punarhastyādivadabhyāsārthamadhyayanam | yajñeṣvadhi adhiyajñaṃ vidhāyakaṃ brāhmaṇam | ādhidaivikamadhidaivaṃ bhavaṃ devatāprakāśakamantrāḥ | teṣāmeva viśeṣa ādhyātmikamiti | "ahaṃ manurabhavam" "ahaṃ rudrebhiḥ" ityādi | 'vedānta' iti yadabhihitaṃ tadapi karmajñānasamuccayaṃ brahmatvāya darśayati |

Medhātithi’s commentary (manubhāṣya):
What this verse permits (for the Renunciate) is the mere reciting of the texts, and not the repeating and getting up of them, as is prescribed for the householder.

‘Bearing upon sacrifices’—i.e., the Brāhmaṇa texts prescribing the sacrificial rites.

‘Dealing with deities’—those indicating the deities of sacrifices.

A particular kind of texts of this last class is ‘those dealing with the Soul;’—i. e., ‘aham manurabhavam &c,’ ‘aham rudrebhiḥ etc.’ and so forth.

Which have been called ‘Vedānta’—and which deal with Action and Knowledge both. This shows that it is the combination of these two that makes one reach Brahman.—(83)