BṚHADĀRAṆYAKA UPANISHAD · 6.4.25

अथास्य दक्षिणं कर्णम् अभिनिधाय वाग् वाग् इति त्रिः ।
अथ दधि मधु घृतं संनीयानन्तर्हितेन जातरूपेण प्राशयति ।
भूस् ते दधामि भुवस् ते दधामि स्वस् ते दधामि भूर् भुवः स्वः सर्वं त्वयि दधामीति ॥

athāsya dakṣiṇaṃ karṇam abhinidhāya vāg vāg iti triḥ ।
atha dadhi madhu ghṛtaṃ saṃnīyānantarhitena jātarūpeṇa prāśayati ।
bhūs te dadhāmi bhuvas te dadhāmi svas te dadhāmi bhūr bhuvaḥ svaḥ sarvaṃ tvayi dadhāmīti ॥

Then he draws down to the child's right ear and says 'Speech! Speech!' three times. Then he mingles coagulated milk, honey, and ghee and feeds [his son] out of a gold [spoon] which is not placed within [the mouth], saying: 'I place in you Bhûr! I place in you Bhuvas! I place in you Svar! Bhûr, Bhuvas, Svar---everything I place in you!'

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