Related על יומא 59:9

[This] law [has been taught in the laws] of a meal. [A person] who goes out [of the dining room] to relieve himself, [when he goes back to the table] he washes one hand. [A person who goes out of the dining room] to speak to his friend, and makes a [long] interruption [by talking for a long time, when he goes back to the table he] washes both of his hands. Where does he wash them? He comes [back to the table], sits down in his place, and washes [his hands]. And he returns the pitcher [with which he washed his hands to the waiter who shows it] to the [other] guests [who are sitting together with him in the dining room].