Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 7

Sanskrit:

ब्रह्मवेषधरो गत्वा तं भिक्षेत वृकोदर: ।हनिष्यति न सन्देहो द्वैरथे तव सन्निधौ ॥ ७ ॥

ITRANS:

brahma-veṣa-dharo gatvātaṁ bhikṣeta vṛkodaraḥhaniṣyati na sandehodvai-rathe tava sannidhau

Translation:

Bhīma should go to him disguised as a brāhmaṇa and beg charity. Thus he will obtain single combat with Jarāsandha, and in Your presence Bhīma will no doubt kill him.

Purport:

The idea is that Bhīma should beg as charity a one-to-one fight with Jarāsandha.