SB 10.36.1
sri badarayanir uvaca
atha tarhy agato gostham
aristo vrsabhasurah
mahim maha-kakut-kayah
kampayan khura-viksatam
Translation:
Sukadeva Goswami said: The demon Arista then came to the cowherd village. Appearing in the form of a bull with a large hump, he made the earth tremble as he tore it apart with his hooves.
Purport:
According to the Sri Visnu Purana, Aristasura entered Krsna’s village at twilight, as the Lord prepared to dance with the gopis:
prodosardhe kadacit tu
rasasakte janardane
trasayan sa-mado gostham
aristah sampagatah
“Once, midway through the period of dusk, when Lord Janardana was eager to perform the rasa dance, Aristasura madly entered the cowherd village, terrifying everyone.”