Walking on ancient roads and paths in sandals or other simple footwear left feet dusty and dirty. Providing water allowed a visitor to wash and refresh them after travel.
Foot washing appears repeatedly in biblical hospitality scenes. Depending upon circumstances, a person might wash his or her own feet, while servants or others could perform the task in households where such service was available.
A host could provide a basin or other vessel and water after a guest arrived. The act was practical, but personally washing another person's feet could also express humility and service.
Basins, water vessels, domestic water installations, and household architecture provide the material setting for washing, although they cannot normally identify a vessel used specifically for guests' feet.
Biblical and early Christian writings explicitly mention washing the feet of travelers and guests, providing strong evidence for the practice.
Abraham offers water for his visitors' feet in Genesis 18:4, and similar acts of hospitality appear elsewhere in the Hebrew Bible.
In Luke 7:44 Jesus notes that Simon provided no water for His feet. In John 13 Jesus goes much further by washing His disciples' feet Himself and using the humble action to teach them about serving one another.
Foot washing was a practical response to travel conditions and was recognized in biblical tradition as an act associated with hospitality.
We cannot assume that every host personally washed every guest's feet; texts also support simply providing water for washing.
The ordinary hospitality practice gives added force to Jesus' extraordinary decision to kneel and wash the feet of His own disciples.