Srimad Bhagavatam Canto 07, Chapter 10, Text 62

SB 7.10.62

vatsas casit tada brahma
 svayam visnur ayam hi gauh
pravisya tripuram kale
 rasa-kupamrtam papau
 
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
Then Lord Brahma became a calf and Lord Visnu a cow, and at noon they entered the residences and drank all the nectar in the well.
Srimad Bhagavatam Canto 07, Chapter 10, Text 61
Srimad Bhagavatam Canto 07, Chapter 10, Text 63