For the source text click/tap here: Gittin 40
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A new Mishnah states: A slave whose master pledged him to others as an apotiki (A person may designate any type of property as security to the creditor without placing it in the possession of the creditor. The creditor has a lien on this property, and if the debt is not otherwise repaid, the creditor can collect his debt from the security. This security is called an apotiki.) and freed him, according to the letter of the law, the slave is not liable for anything, but for the benefit of the public, they force his master to make him a free man, and the slave writes a document for his value. Rabban Shimon ben Gamliel says: The slave does not write it, but rather, the one who frees him.
We explore bills of manumission in history.