तस्मादोमित्युदाहृत्य यज्ञदानतपःक्रियाः।प्रवर्तन्ते विधानोक्ताः सततं ब्रह्मवादिनाम्
tasmād oṁ ity udāhṛitya yajña-dāna-tapaḥ-kriyāḥ pravartante vidhānoktāḥ satataṁ brahma-vādinām
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."
Translated by Shri Purohit Swami
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.
Translated by Swami Sivananda
Word meanings (from the gita/gita dataset)
tasmāt—therefore; om—sacred syllable om; iti—thus; udāhṛitya—by uttering; yajña—sacrifice; dāna—charity; tapaḥ—penance; kriyāḥ—performing; pravartante—begin; vidhāna-uktāḥ—according to the prescriptions of Vedic injunctions; satatam—always; brahma-vādinām—expounders of the Vedas