Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 3

Sanskrit:

बद्ध्वा परिकरं शौरि: समुह्य कुटिलालकान् । उवाच हस्तिपं वाचा मेघनादगभीरया ॥ ३ ॥

ITRANS:

baddhvā parikaraṁ śauriḥsamuhya kuṭilālakānuvāca hastipaṁ vācāmegha-nāda-gabhīrayā

Translation:

Securely binding up His clothes and tying back His curly locks, Lord Kṛṣṇa addressed the elephant-keeper with words as grave as the rumbling of a cloud.

Purport:

Lord Kṛṣṇa was obviously preparing for a fight. According to Śrīla Viśvanātha Cakravartī Ṭhākura, the Lord put aside His jacket, tightened His belt and tied back His hair.