Paraskaragrihyasutra 3.16.1

3.16.1

athāto 'dhītyādhītyānirākaraṇaṃ pratīkaṃ me vicakṣaṇa jihvā me madhu yadvacaḥ \ karṇābhyāṃ bhūriśuśruve mā tvaṃ hārṣīḥ śrutaṃ mayi \ brahmaṇaḥ pravacanamasi brahmaṇaḥ pratiṣṭhānamasi brahmakośosi sanirasi śāntirasyanirākaraṇamasi brahmakośaṃ me viśa \ vācā tvā pidadhāmi vācā tvā pidadhāmīti svarakaraṇakaṇṭhyaurasadantyauṣṭhyagrahaṇadhāraṇoccāraṇaśaktirmayi bhavatu āpyāyantu me 'ṅgāni vāk prāṇaścakṣuḥ śrotraṃ yaśo balam \ yanme śrutamadhītaṃ tanme manasi tiṣṭhatu tiṣṭhatu \23\

Now each time after a lesson (of the Veda) is finished, in order to prevent his forgetting (the texts he has studied, the following prayer should be recited):
May my mouth be skilful; my tongue be honey-sweet speech. With my ears I have heard much; do not take away that which I have heard, which dwells in me.
The Brahman's word art thou; the Brahman's stand art thou; the Brahman's store-house art thou. Fulfilment art thou; peace art thou; unforgetfulness art thou; enter into my store-house of the Brahman. With the voice I cover thee! With the voice I cover thee! May I be able to form the vowels, to produce, to hold fast and to utter the guttural, pectoral, dental, and labial sounds. May my limbs grow strong, my voice, breath, eye, ear, honour, and power. What I have heard and studied, may that be fixed in my mind; may that be fixed in my mind.'
End of the Third Kânda.
End of Pâraskara's Grihya-sûtra.