The Gemara cited to support the proposition, which both Resh Lakish and Rabbi Johanan held, that on the mid-festival days ("Chol HaMoed") it is forbidden to work. For the Rabbis taught in a Baraita the view of Rabbi Josiah that because the word "keep" is read to imply prohibition of work, the words, "The Feast of Unleavened Bread shall you keep, seven days," in teach that work is forbidden for seven days, and thus work is forbidden on the mid-festival days.