śatror janma-mṛtī vidvāñ
jīvitaḿ ca jarā-kṛtam
pārtham āpyāyayan svena
tejasācintayad dhariḥ
satroh -- of the enemy; janma -- the birth; mriti -- and death; vidvan -- knowing; jivitam -- the bringing to life; ca -- and; jara -- by the demoness Jara; kritam -- done; partham -- Bhima, the son of Pritha; apyayayan -- empowering; svena -- with His own; tejasa -- potency; acintayat -- thought; harih -- Lord Krishna.
Lord Krishna knew the secret of His enemy Jarasandha's birth and death, and also how he had been given life by the demoness Jara. Considering all this, Lord Krishna imparted His special power to Bhima.
Srila Prabhupada writes that Lord Krishna "knew the mystery of the birth of Jarasandha. Jarasandha 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 Jara. She managed to join the two parts of the baby from top to bottom. Knowing this, Lord Krishna therefore also knew how to kill him."
