Bg 9.17

pitaham asya jagato
mata dhata pitamahah
vedyam pavitram om-kara
rk sama yajur eva ca

Word for word: 
pita — father; aham — I; asya — of this; jagatah — universe; mata — mother; dhata — supporter; pitamahah — grandfather; vedyam — what is to be known; pavitram — that which purifies; om-kara — the syllable om; rk — the Rg Veda; sama — the Sama Veda; yajuh — the Yajur Veda; eva — certainly; ca — and.

Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
I am the father of this universe, the mother, the support and the grandsire. I am the object of knowledge, the purifier and the syllable om. I am also the Rg, the Sama and the Yajur Vedas.

Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
The entire cosmic manifestations, moving and nonmoving, are manifested by different activities of Krishna’s energy. In the material existence we create different relationships with different living entities who are nothing but Krishna’s marginal energy; under the creation of prakrti some of them appear as our father, mother, grandfather, creator, etc., but actually they are parts and parcels of Krishna. As such, these living entities who appear to be our father, mother, etc., are nothing but Krishna. In this verse the word dhata means “creator.” Not only are our father and mother parts and parcels of Krishna, but the creator, grandmother and grandfather, etc., are also Krishna. Actually any living entity, being part and parcel of Krishna, is Krishna. All the Vedas, therefore, aim only toward Krishna. Whatever we want to know through the Vedas is but a progressive step toward understanding Krishna. That subject matter which helps us purify our constitutional position is especially Krishna. Similarly, the living entity who is inquisitive to understand all Vedic principles is also part and parcel of Krishna and as such is also Krishna. In all the Vedic mantras the word om, called pranava, is a transcendental sound vibration and is also Krishna. And because in all the hymns of the four Vedas – Sama, Yajur, Rg and Atharva – the pranava, or om-kara, is very prominent, it is understood to be Krishna.