Hillel the Elder
Hillel the Elder when his students would leave
He went with them
His students said to him:
Rabbi, where are you going?
He said to them:
To give charity to a guest who is in my home.
They said to him: Every day you have a guest:
And he said to them: Because it is a sad soul who does not host with his body:
Today it is here, tomorrow it is not here.