Hadith 3615
Sayyiduna Abdullah bin Busr Mazani, who was a companion of the Prophet Muhammad (peace be upon him), says: "You have seen these hands of mine; with them I pledged allegiance on the blessed hand of the Prophet Muhammad (peace be upon him). I heard him say: 'Do not fast on Saturday, except for the fast that is obligatory upon you. And if a person finds only the root of a tree to chew (to break the fast on Saturday), then he should break his fast with that.'"