BṚHADĀRAṆYAKA UPANISHAD · 6.4.24

जाते ऽग्निम् उपसमाधायाङ्क आधाय कंसे पृषदाज्यं संनीय पृषदाज्यस्योपघातं जुहोति --
अस्मिन्सहस्रं पुष्यासम् एधमानः स्वे गृहे ।
अस्योपसन्द्यां मा छैत्सीत् प्रजया च पशुभिश् च स्वाहा ।
मयि प्राणांस् त्वयि मनसा जुहोमि स्वाहा ।
यत् कर्मणात्यरीरिचम् यद् वा न्यूनम् इहाकरम् ।
अग्निष्टत् स्विष्टकृद् विद्वान् स्विष्टं सुहुतं करोतु नः स्वाहेति ॥

jāte ’gnim upasamādhāyāṅka ādhāya kaṃse pṛṣadājyaṃ saṃnīya pṛṣadājyasyopaghātaṃ juhoti --
asminsahasraṃ puṣyāsam edhamānaḥ sve gṛhe ।
asyopasandyāṃ mā chaitsīt prajayā ca paśubhiś ca svāhā ।
mayi prāṇāṃs tvayi manasā juhomi svāhā ।
yat karmaṇātyarīricam yad vā nyūnam ihākaram ।
agniṣṭat sviṣṭakṛd vidvān sviṣṭaṃ suhutaṃ karotu naḥ svāheti ॥

When [the son] is born, he [i. e. the father] builds up a fire, places him on his lap, mingles ghee and coagulated milk in a metal dish, and makes an oblation, ladling out of the mingled ghee and coagulated milk, and saying- 'In this son may I be increased, And have a thousand in mine house! May nothing rob his retinue Of offspring or of animals! Hail! The vital powers (prâna) which are in me, my mind, I offer in you. Hail! What in this rite I overdid, Or what I have here scanty made-- Let Agni, wise, the Prosperer, Make fit and good our sacrifice! Hail!'

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