Vishnupurana 4.2.27

4.2.27

suptāṃś ca tān ṛṣīn naivotthāpayām āsa |
tac ca kalaśajalam aparimeyamāhātmyaṃ mantrapūtaṃ papau ||

Yuvanáśwa had no son, at which he was deeply grieved. Whilst residing in the vicinage of the holy Munis, he inspired them with pity for his childless condition, and they instituted a religious rite to procure him progeny. One night during its performance the sages having placed a vessel of consecrated water upon the altar had retired to repose. It was past midnight, when the king awoke, exceedingly thirsty; and unwilling to disturb any of the holy inmates of the dwelling, he looked about for something to drink. In his search he came to the water in the jar, which had been sanctified and endowed with prolific efficacy by sacred texts, and he drank it. When the Munis rose, and found that the water had been drunk, they inquired who had taken it, and said, "The queen that has drunk this water shall give birth to a mighty and valiant son." "It was I," exclaimed the Rájá, "who unwittingly drank the water!" and accordingly in the belly of Yuvanáśwa was conceived a child, and it grew, and in due time it ripped open the right side of the Rájá, and was born, and the Raji, did not die. Upon the birth of the child, "Who will be its nurse?" said the Munis; when, Indra, the king of the gods, appeared, and said, "He shall have me for his nurse" (mám dhásyati); and hence the boy was named Mándhátri. Indra put his fore finger into the mouth of the infant, who sucked it, and drew from it heavenly nectar; and he grew up, and became a mighty monarch, and reduced the seven continental zones under his dominion. And here a verse is recited; "From the rising to the going down of the sun, all that is irradiated by his light, is the land of Mándhátri, the son of Yuvanáśwa."