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अहं क्रतुरहं यज्ञ स्वधाहमहमौषधम् |
मन्त्रोऽहमहमेवाज्यमहमग्निरहं हुतम् || 16||
पिताहमस्य जगतो माता धाता पितामह |
वेद्यं पवित्रमोङ्कार ऋक्साम यजुरेव च || 17||
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9.16-17
It is I who am the Vedic ritual, I am the sacrifice, and I am the oblation offered to the ancestors. I am the medicinal herb, and I am the Vedic mantra. I am the clarified butter, I am the fire and the act of offering. Of this universe, I am the Father; I am also the Mother, the Sustainer, and the Grandsire. I am the purifier, the goal of knowledge, the sacred syllable Om. I am the Ṛig Veda, Sāma Veda, and the Yajur Veda.

In these verses, Shree Krishna gives a glimpse into the various aspects of His infinite personality.
Kratu
means
yajña
(sacrifice), such as
agnihotra
yajñas
mentioned in the Vedas.  It also refers to the
yajñas
, such as
vaiśhva deva
that are described in the Smṛiti scriptures.
Auṣhadham
refers to the potency in medicinal herbs.
Creation emanates from God, and hence He is its
Pitā
(Father).  Before creation, He holds the unmanifested material energy in His womb, and so He is also its
Mātā
(Mother).  He maintains the universe and nourishes it, and thus He is its
Dhātā
(Sustainer).  He is also the Father of Brahma, who is the creator, and hence, He is the Grandfather of this universe.
The Vedas have emanated from God.  The Ramayan states
jākī sahaja svāsa śhruti chārī
“God manifested the Vedas by His breath.”  They are the knowledge potency of God, and hence an aspect of His unlimited personality.  Shree Krishna states this truth dramatically by saying that He is the Vedas.