SB 10.46.44
evam nisa sa bruvator vyatita
nandasya krsnanucarasya rajan
gopyah samutthaya nirupya dipan
vastun samabhyarcya daudhiny amanthun
Translation:
While Krsna’s messenger continued speaking with Nanda, the night ended, O King. The women of the cowherd village rose from bed and, lighting lamps, worshiped their household deities. Then they began churning the yogurt into butter.