The baby cried so much for breast milk that all the brāhmaṇas were very unhappy. “Who will take care of this baby?” they said. Then Indra, who was worshiped in that yajña, came and solaced the baby. “Do not cry,” Indra said. Then Indra put his index finger in the baby’s mouth and said, “You may drink me.”
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
कं धास्यति कुमारोऽयं स्तन्यं रोरूयते भृशम् । मां धाता वत्स मा रोदीरितीन्द्रो देशिनीमदात्
kaṃ dhāsyati kumāro'yaṃ stanyaṃ rorūyate bhṛśam | māṃ dhātā vatsa mā rodīritīndro deśinīmadāt
SB 9.6.31