Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 26
Sanskrit:
तावत् प्रविष्टास्त्वसुरोदरान्तरंपरं न गीर्णा: शिशव: सवत्सा: ।प्रतीक्षमाणेन बकारिवेशनंहतस्वकान्तस्मरणेन रक्षसा ॥ २६ ॥
ITRANS:
tāvat praviṣṭās tv asurodarāntaraṁparaṁ na gīrṇāḥ śiśavaḥ sa-vatsāḥpratīkṣamāṇena bakāri-veśanaṁhata-sva-kānta-smaraṇena rakṣasā
Translation:
In the meantime, while Kṛṣṇa was considering how to stop them, all the cowherd boys entered the mouth of the demon. The demon, however, did not swallow them, for he was thinking of his own relatives who had been killed by Kṛṣṇa and was just waiting for Kṛṣṇa to enter his mouth.