CHĀNDOGYA UPANISHAD · 4.17.8

एवम् एषां लोकानाम् आसां देवतानाम् अस्यास् त्रय्या विद्याया वीर्येण यज्ञस्य विरिष्टं संदधाति ।
भेषजकृतो ह वा एष यज्ञो यत्रैवंविद् ब्रह्मा भवति ॥

evam eṣāṃ lokānām āsāṃ devatānām asyās trayyā vidyāyā vīryeṇa yajñasya viriṣṭaṃ saṃdadhāti ।
bheṣajakṛto ha vā eṣa yajño yatraivaṃvid brahmā bhavati ॥

Thus does one bind together and heal any break in the sacrifice by means of (the Vyâhritis or sacrificial interjections which are) the essence and strength of the three worlds, of the deities, and of the threefold knowledge. That sacrifice is healed in which there is a Brahman priest who knows this.

F. Max Müller · The Upanishads, Sacred Books of the East 1 (1879)