Bhagavad Gita 17.24

तस्मादोमित्युदाहृत्य यज्ञदानतपःक्रियाः।प्रवर्तन्ते विधानोक्ताः सततं ब्रह्मवादिनाम्॥

tasmādomityudāhṛtya yajñadānatapaḥkriyāḥ |pravartante vidhānoktāḥ satataṃ brahmavādinām ||

Therefore, with the utterance of "Om," the acts of sacrifice, gift, and austerity, as enjoined in the scriptures, are always begun by the students of Brahman.

Therefore, all acts of sacrifice, gifts, and austerities prescribed by the scriptures are always begun by those who understand the Spirit with the word "Om."

Our plain-language meaning of this verse is waiting for scholar review.