Shabbat 123a and Shabbat 123b, some basics of muktzeh, particularly moving a davar she-melakhto le-issur, an item normally used for a Shabbat prohibited purpose, with the categories of le-tzorekh gufo, to use its physical properties, le-tzorekh mekomo, the person needs the spot where it is, and me-hamah le-tzel, to get it out of the sun. With the history of how it started, the Jews’ failure to observe Shabbat in Nehemiah’s time.
