Bhagavad Gītā Chapter Seven verse 8

raso ’ham apsu kāunteya prabhāsmi śaśisūryayoḥ |
praṇavaḥ sarvavedeṣu śabdaḥ khe pāuruṣaṃ nṛṣu ||

praṇava - sacred syllable; the syllable that gives life; the mystical name of the deity; the mystical or sacred syllable om; name of the trinityśabda - words, sound, language

Commentaries and Reflections

Commentary by T Krishnamacharya:

“The taste in the water cannot be seen.
Only when we put the water in our mouths.
So it is with Bhakti.”