In the story of the life of the Buddha, in the early days of the saṃgha the monks had no fixed abode but wandered throughout the year. Eventually, the Buddha instructed monks to cease their peregrinations during the torrential monsoon period in order to prevent the killing of insects and worms while walking on muddy roads.

Robert E. Buswell and Donald S. Lopez (eds.), The Princeton dictionary of Buddhism, Princeton, 2014, p. 968