Mahabharata 1.16.28

1.16.28

tato brahmāṇamāsīnaṃ devā varadamabruvan |
śrāntāḥ sma subhṛśaṃ brahmannodbhavatyamṛtaṃ ca tat || 28 ||

"After the churning, O Brahmana, had gone on for some time, gummy exudations of various trees and herbs vested with the properties of amrita mingled with the waters of the Ocean. And the celestials attained to immortality by drinking of the water mixed with those gums and with the liquid extract of gold. By degrees, the milky water of the agitated deep turned into clarified butter by virtue of those gums and juices. But nectar did not appear even then. The gods came before the boon-granting Brahman seated on his seat and said, 'Sire, we are spent up, we have no strength left to churn further. Nectar hath not yet arisen so that now we have no resource save Narayana.'