He replied: Revered Sir! Dear friend, your face shines like that of one who knows Brahman. Who has taught you? Who should teach me, Sir? Here he conceals the fact, as it were. And he said pointing to the fires: For this reason they are of this form now, though they were of a different form before. Dear friend, what did they teach you? This, Upakosala replied and repeated some of what the fires had told him. The teacher said: They told you, dear friend, only about the worlds, but I shall tell you about Brahman. As water does not cling to the lotus leaf, so no evil clings to one who knows this. Upakosala said to him: Revered Sir, please tell me.

Sama Veda, Chandogya Upanishad IV, XIV - Dialogue between the Teacher and the Pupil, 2-3

He said: The person that is seen in the eye-that is the Self. This is the immortal, the fearless; this is Brahman. That is why, if one drops melted butter or water in the eye, it flows away on both sides.

Sama Veda, Chandogya Upanishad IV, XV - Instruction by the Teacher, 1

The seers call him Samyadvama, for all blessings (vama) go towards him (samyanti). All blessings go towards him who knows this.

Sama Veda, Chandogya Upanishad IV, XV - Instruction by the Teacher, 2

He is also Vamani, for he carries to living beings (nayati) all blessings (vama). He who knows this carries all blessings.

Sama Veda, Chandogya Upanishad IV, XV - Instruction by the Teacher, 3

From the fountain whose bucket is well-prepared with good strong ropes, where water flows freely-- from this copious fountain we draw, inexhaustible.

Rig Veda X, 101, 6