Chapter 9, Verse 16
Part of 9: Rāja Vidyā Yog — राजविद्याराजगुह्ययोगअहं क्रतुरहं यज्ञः स्वधाऽहमहमौषधम्। मंत्रोऽहमहमेवाज्यमहमग्निरहं हुतम्॥
ahaṁ kratur ahaṁ yajñaḥ svadhāham aham auṣhadham mantro ’ham aham evājyam aham agnir ahaṁ 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.
Kratu is a kind of Vedic sacrifice. Yajna is the worship enjoined in the Smriti or the holy books laying down lay and the code of conduct. I am the Mantra, the chant with which the oblation is offered to the manes or ancestors, and the shining ones (the Devatas or gods). Hutam also means the act of offering. Aushadham All plants including rice and barley or medicine that can cure diseases. (Cf. IV.24)