balinām api cānyeṣāṁ
bhīmaṁ sama-balaṁ vinā
Śrīdhara Svāmī explains that the Yādavas were extremely eager to kill Jarāsandha, and thus to caution them Śrī Uddhava spoke this verse. Jarāsandha’s death could come only at the hand of Bhīma. Śrīla Viśvanātha Cakravartī adds that Uddhava had previously deduced this from the Jyotīr-rāga and other astrological scriptures he had learned from his teacher Bṛhaspati.