Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 40

Sanskrit:

शत्रोर्जन्ममृती विद्वाञ्जीवितं च जराकृतम् ।पार्थमाप्याययन् स्वेन तेजसाचिन्तयद्धरि: ॥ ४० ॥

ITRANS:

śatror janma-mṛtī vidvāñjīvitaṁ ca jarā-kṛtampārtham āpyāyayan svenatejasācintayad dhariḥ

Translation:

Lord Kṛṣṇa knew the secret of His enemy Jarāsandha’s birth and death, and also how he had been given life by the demoness Jarā. Considering all this, Lord Kṛṣṇa imparted His special power to Bhīma.

Purport:

Śrīla Prabhupāda writes that Lord Kṛṣṇa “knew the mystery of the birth of Jarāsandha. Jarāsandha was born in two different parts from two different mothers. When his father saw that the baby was useless, he threw the two parts in the forest, where they were later found by a black-hearted witch named Jarā. She managed to join the two parts of the baby from top to bottom. Knowing this, Lord Kṛṣṇa therefore also knew how to kill him.”