"Accepting the task of hospitality, the patriarch used to sit by the entrance of his tent inviting all who passed by, and his table was laden for all comers including the impious and barbarians, without distinction. Hence he was found worthy of that wonderful banquet when he received angels and the Master of all as his guest. We too, then, should actively and eagerly cultivate hospitality, so that we may receive not only angels, but also God Himself. For 'asmuch', says the Lord, 'as you have done it to one of the least of these My brethren you have done it unto Me' Matt 25:40."
The Philokalia Vol 2 pg 32