Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 36

Sanskrit:

अव्यक्तलिङ्गं प्रकृतिष्वन्त:पुरगृहादिषु ।क्व‍‍चिच्चरन्तं योगेशं तत्तद्भ‍ावबुभुत्सया ॥ ३६ ॥

ITRANS:

avyakta-lingaṁ prakṛtiṣvantaḥ-pura-gṛhādiṣukvacic carantaṁ yogeśaṁtat-tad-bhāva-bubhutsayā

Translation:

Somewhere Kṛṣṇa, the Lord of mystic power, was moving about in disguise among the homes of ministers and other citizens in order to understand what each of them was thinking.

Purport:

Although Lord Kṛṣṇa is all-knowing, while executing His pastimes as a typical monarch He sometimes traveled about incognito to acquire necessary information about His kingdom.