Srimad Bhagavatam Canto 05, Chapter 03, Text 17

SB 5.3.17

sri-bhagavan uvaca
aho bataham rsayo bhavadbhir avitatha-girbhir varam asulabham abhiyacito yad amusyatmajo maya sadrso bhuyad iti mamaham evabhirupah kaivalyad athapi brahma-vado na mrsa bhavitum arhati mamaiva hi mukham yad dvija-deva-kulam.
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
The Supreme Personality of Godhead replied: O great sages, I am certainly very pleased with your prayers. You are all truthful. You have prayed for the benediction of a son like Me for King Nabhi, but this is very difficult to obtain. Since I am the Supreme Person without a second and since no one is equal to Me, another personality like Me is not possible to find. In any case, because you are all qualified brahmanas, your vibrations should not prove untrue. I consider the brahmanas who are well qualified with brahminical qualities to be as good as My own mouth.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
The word avitatha-girbhih means “they whose spoken vibrations cannot be nullified.” The brahmanas (dvija, the twice-born), are given a chance by the sastric regulations to become almost as powerful as the Supreme Lord. Whatever a brahmana speaks cannot be nullified or changed in any circumstance. According to the Vedic injunctions, a brahmana is the mouth of the Supreme Personality of Godhead; therefore in all rituals a brahmana is offered food (brahmana-bhojana) because when a brahmana eats, it is considered that the Supreme Lord Himself eats. Similarly, whatever a brahmana speaks cannot be changed. It must act. The learned sages who were priests at Maharaja Nabhi’s sacrifice were not only brahmanas but were so qualified that they were like devas, demigods, or God Himself. If this were not the case, how could they invite Lord Visnu to come to the sacrificial arena? God is one, and God does not belong to this or that religion. In Kali-yuga, different religious sects consider their God to be different from the God of others, but that is not possible. God is one, and He is appreciated according to different angles of vision. In this verse the word kaivalyat means that God has no competitor. There is only one God. In the Svetasvatara Upanisad (6.8) it is said, na tat-samas cabhyadhikas ca drsyate: “No one is found to be equal to Him or greater than Him.” That is the definition of God.
Srimad Bhagavatam Canto 05, Chapter 03, Text 16
Srimad Bhagavatam Canto 05, Chapter 03, Text 18