Shatapatha Brahmana 10.3.5.12

10.3.5.12

tasya vā etasya yajuṣaḥ rasa evopaniṣattasmādyāvanmātreṇa yajuṣādhvaryurgrahaṃ gṛhṇāti sa ubhe stutaśastre anuvibhavatyubhe stutaśastre anuvyaśnute tasmādyāvanmātra ivānnasya rasaḥ sarvamannamavati sarvamannamanuvyeti

But, indeed, the mystic import (upanishad) is the essence of this Yagus; and thus, if, with ever so small a yagus-formula, the Adhvaryu draws a cup of Soma, that (essence) is equal to both the Stotra and the Sastra, and comes up to both the Stotra and the Sastra: hence, however small the essence (flavour) of food, it benefits (renders palatable) the whole food, and pervades the whole food.