9:16  

अहं क्रतुरहं यज्ञः स्वधाहमहमौषधम् ।
मन्त्रोऽहमहमेवाज्यमहमग्निरहं हुतम् ॥९- १६॥

ahaM kraturahaM yadnyaH swadhaahamahamauShadham ।

mantro'hamahamewaajyamahamagnirahaM hutam ॥९- १६॥

Source: Automatic ITRANS Transliteration

I am the ritual, I the sacrifice, I the benediction, I the herbs
I the mantra, I even the ghee, I the fire, I the offering.

(See also 4.24.)

Source: Milind S. Pandit

I am the ritual, I am the Yajna, I am the offering, I am the herb, I am the mantra, I am the Ghee, I am the fire, and I am the oblation. (See also 4.24)

Source: The Bhagavad-Gita: The Sacred Song

But it is I who am the ritual, I the sacrifice, the offering to the ancestors, the healing herb, the transcendental chant. I am the butter and the fire and the offering.

Source: Bhagavad Gita As It Is