Guest. In ancient India a welcome for athithis was as important as a yajna. All good karma that a  person earned would disappear if a brahmin guest was not given rice, as per Manusmriti Chapter 100 verse 3.

According to Manu, a person who visits once in a while is a guest. Anyone who stays in the same region and uses this as an excuse to visit daily need not be deemed as a guest. Irrespective of whether a guest comes in before or after dinner, he should be given a meal. Even if a vaishya or a shudra arrived at a brahmin’s place as a guest, he should offer them meals along with his servants.