17:24
तस्मादोमित्युदाहृत्य यज्ञदानतपःक्रियाः ।
प्रवर्तन्ते विधानोक्ताः सततं ब्रह्मवादिनाम् ॥१७- २४॥
tasmaadomityudaahRRitya yadnyadaanatapaHkriyaaH ।
prawartante widhaanoktaaH satataM brahmawaadinaam ॥१७- २४॥
Source: Automatic ITRANS Transliteration
Therefore, exemplary ritual sacrifices, donations, austerities, with "Aum"
Opening-uttered are always commenced by the knowers of Brahman.
Source: Milind S. Pandit
Therefore, acts of sacrifice, charity, and austerity prescribed in the scriptures are always commenced by uttering "OM" by the knowers of Brahman.
Thus the transcendentalists undertake sacrifices, charities, and penances, beginning always with om, to attain the Supreme.
Source: Bhagavad Gita As It Is