Srimad-Bhagavatam: Canto 3 - Chapter 1 - Verse 11

Sanskrit:

खराश्च कर्कशै: क्षत्त: खुरैर्घ्नन्तो धरातलम् ।खार्काररभसा मत्ता: पर्यधावन् वरूथश: ॥ ११ ॥

ITRANS:

kharāś ca karkaśaiḥ kṣattaḥkhurair ghnanto dharā-talamkhārkāra-rabhasā mattāḥparyadhāvan varūthaśaḥ

Translation:

O Vidura, the asses ran hither and thither in herds, striking the earth with their hard hooves and wildly braying.

Purport:

Asses also feel very respectable as a race, and when they run in flocks hither and thither in so-called jollity, it is understood to be a bad sign for human society.