Tradition
St. Benedict of Nursia
The Rule of St. Benedict
Chapter LVI. Of the Abbot's Table
CHAPTER LVI
Of the Abbot's Table
Let the Abbot's table always be with the guests and travelers. When, however, there are no guests, let it be in his power to invite any of the brethren he desireth. Let him provide, however, that one or two of the seniors always remain with the brethren for the sake of discipline.
Source: The Rule of St. Benedict (CCEL)