Judges 19:21
So he brought him into his house, and gave provender unto the asses: and they washed their feet, and did eat and drink. So he brought him into his house, and gave provender unto the asses: and they washed their feet, and did eat and drink.
The closing chapters of Judges, chapters 17 through 21, record events that occurred in the early part of the history of the judges, while the real story of the book ends with chapter 16. Those closing chapters record Israel's backsliding into grave moral disorder, when people did what was right in their own eyes rather than following God's standard. That backsliding brought disgrace and punishment marked by internecine strife, ruffianism, and bloodshed. In particular, the verse belongs to the account of the crime of the people of Gibeah, with whom the whole tribe of Benjamin identified itself.
The verse describes customary hospitality in which the old man brought the Levite and his companions into his house, gave provender to their asses, and then ate and drank with them. He supplied water for the guests to wash their own feet, presenting the host as providing a place and water for washing rather than washing his guests' feet himself. It is an example of the household custom of hospitality in which guests washed their own feet, not the host.
The hospitality shown illustrates a society in which conventional hospitality was valued above a woman's virtue, a misplaced priority that offers no excuse for sin. The backsliding of Israel seen in this part of Judges does not mean anyone can backslide with impunity.