Bhagavad Gita 9.16

अहं क्रतुरहं यज्ञः स्वधाऽहमहमौषधम्।मंत्रोऽहमहमेवाज्यमहमग्निरहं हुतम् ॥९.१६॥

ahaṃ kraturahaṃ yajñaḥ svadhā’hamahamauṣadhammaṃtro’hamahamevājyamahamagnirahaṃ hutam

I am Kratu; I am Yajna; I am the offering to the manes; I am the medicinal herbs and all plants; I am the Mantra; I am also the ghee or melted butter; I am the fire; I am the oblation.

गीता