BṚHADĀRAṆYAKA UPANISHAD · 6.4.18

अथ य इच्छेत् -- पुत्रो मे पण्डितो विगीतः समितिंगमः शुश्रूषितां वाचं भाषिता जायेत सर्वान् वेदान् अनुब्रुवीत सर्वम् आयुर् इयाद् इति मांसौदनं पाचयित्वा सर्पिष्मन्तम् अश्नीयाताम् ।
ईश्वरौ जनयितवाइ ।
औक्षेण वार्षभेण वा ॥

atha ya icchet -- putro me paṇḍito vigītaḥ samitiṃgamaḥ śuśrūṣitāṃ vācaṃ bhāṣitā jāyeta sarvān vedān anubruvīta sarvam āyur iyād iti māṃsaudanaṃ pācayitvā sarpiṣmantam aśnīyātām ।
īśvarau janayitavāi ।
aukṣeṇa vārṣabheṇa vā ॥

Now, in case one wishes, 'That a son, learned, famed, a frequenter of council-assemblies, a speaker of discourse desired to be heard, be born to me! that he be able to repeat all the Vedas! that he attain the full length of life!'--they two should have rice boiled with meat and should eat it prepared with ghee. They two are likely to beget [him], with meat, either veal or beef.

Robert Ernest Hume · The Thirteen Principal Upanishads (1921), Bṛhadāraṇyaka VI.4