Jaiminīya (Talavakāra) Brāhmaṇa 17.76

Now the Aurṇāyava [sāman]. Ūrṇāyu the Gandharva desired the Apsarases. He saw this sāman. With it he praised. By means of it, whomever he desired, saying 'May I go to her,' whomever he touched, to her he went, her he obtained. This is a wish-granting sāman. He desired this desire. That desire was fulfilled for him. With whatever desire one praises with this sāman, that desire is fulfilled for him. Because Ūrṇāyu the Gandharva saw it, therefore it is called the Aurṇāyava.

The Aṅgirases, desiring heaven, sat for a sacrificial session.

They did not discern the heavenly world.

Śvitra Āṅgirasa, bearing a firewood-door, went forth.

Ūrṇāyu the Gandharva, swooping down from above with this sāman, said to him: 'This sāman leads to heaven.'

'Praise with it. Only having praised with it will you discern the heavenly world.'

'Speak of it, however, as my sāman.'

"Whoever should ask you, 'Who told you this?', just say, 'Ūrṇāyu told me.'"

'Do not speak of it as belonging to anyone other than me.'

He returned and said: 'This sāman leads to heaven.'

'Let us praise with it.'

'Only having praised with it will we discern the heavenly world.'

They said to him: 'Who spoke this to you?'