B.G 9.16 and 17

ahaṁ kraturahaṁ yajñaḥ svadhā'hamahamauṣadham। mantro'hamahamevājyam ahamagnirahaṁ hutam ॥16॥

I am the ritual, I am the sacrifice, I am the offering to the ancestors, I am the medicinal herb; I am the mantra, I am the clarified butter, I am the fire, I am the act of offering.

pitā'hamasya jagato mātā dhātā pitāmahaḥ। vedyaṁ pavitramoṅkāra r̥k sāma yajureva ca ॥17॥

I am the father of this universe, the mother, the sustainer, and the grandfather; I am the object to be known, the purifier, the sacred syllable Om, and also the Rigveda, the Sāmaveda, and the Yajurveda.

Gīta Bhāshya 9.16 and 17

The lord declares the realized knowledge, that He is everything! 'kratus' - sacrificial rites like Agniṣṭoma. 'yajña' - offering of materials directed toward the gods.

pratijñātaṁ vijñānaṁ āha - ahaṁ kratuḥ ityādinā। kratavaḥ agniṣṭomādayaḥ। yajñaḥ devatāṁ uddiśya dravyaparityāgaḥ।

He declares the realized knowledge—'I am the ritual' and so on. The 'kratus' are sacrificial rites like Agniṣṭoma; 'yajña' is the offering of materials directed toward a deity.

"uddiśya devān dravyāṇāṁ tyāgo yajña itīritaḥ।"

"Sacrifice is said to be the offering of materials directed toward the gods.""

ityabhidhānāt ॥16-17॥

- thus declared (in the dictionary).

Gīta Tātparya 9.16 and 17

'Ṛik' - He is worthy of worship; 'Sāma' - He is equal in all His forms; 'Yajur' - He is the Yajña itself; 'Puruṣottamaḥ' - He is omniscient and thus is the Supreme Person; 'Kratu' - He is of the nature of action; 'Svadhā' - As He is upheld by no other; 'māntra' - as He is the protector; 'auṣadham' - as He is the refuge for those in trouble; 'ājya' - as he is not adulterated; 'darbha' - as He the bearer of grass; 'hutam' - as He is the oblation; 'agni' - as he is the leader of the path.

"arcyatvādr̥k samatvācca nijarūpeṣu sāma saḥ। yājyatvāt sa yajuryajñaḥ sārvajñyāt puruṣottamaḥ॥ kratuḥ kr̥tisvarūpatvāt svadhā'nanyadhr̥to yataḥ। mānāt trātīti mantro'yamuṣṭānāṁ nidhirauṣadham॥ ajyāyastvādājyanāmā darbho darabharo yataḥ। ahūtatvāddhutaṁ cāyamagnirnetāgateryataḥ॥"

"Due to being worthy of worship, He is called the 'Ṛik'; due to sameness in His own forms, He is called the 'Sāma'; being the object of sacrifice, He is called the 'Yajur', the Yajña itself; being omniscient, He is the Supreme Person. He is called the 'Kratu' (sacrificial ritual), for He is of the nature of action; He is 'Svadhā', as He is upheld by no other; He is called the 'māntra', as He is the protector, He is the 'auṣadham', i.e. medicine, as He is the refuge for those in trouble. He is called 'ājya', i.e. ghee, as he is not adulterated. He is the sacred 'darbha', i.e. grass, the bearer of it; As he is invoked during the sacrifices, He is called 'hutam', the oblation. He is called 'agni', the fire, as he is the leader of the path."

ityādi ca।

- such are other testimonials.