Muktzeh Marvels

The Gemara records the story of a man who was deathly ill. He did not have any children and he knew that when he passed away, his wife would be subject to perform either yibum or chalitzah. The dying man wished to spare his wife the ordeal and decided to give her a get. He didn’t have a chance to give his wife a get before Shabbos, and he was afraid that after Shabbos it would be too late. Tosfos say that a dying man in a similar situation may technically divorce his wife on Shabbos. However, he may not touch the get because it is muktzeh. Rava therefore devised a plan how the man could divorce his wife without actually touching the get.
Typically, items that do not have a use on Shabbos are muktzeh. This man’s get had a use. He used it to divorce his wife. So why should the get be considered muktzeh? The Rosh offered an interesting explanation. In earlier times, oral law was not allowed to be written down. Only the 24 books of Tanach were permitted to be transcribed. In those times, if one went ahead and wrote down oral law, that book would be muktzeh on Shabbos. The minimum required text of a get is part of oral law. Hence, a get was muktzeh due to its similarity to oral law.