Gittin 40B

ומקרקיש ליה זוזי, וכתב ליה גיטא דחירותא על שמיה.

and the slave should jingle the dinars before him. The child will want the money and he will decide to emancipate him, and they should write him a bill of emancipation in his name.

תנו רבנן, האומר: ״עשיתי פלוני עבדי בן חורין״; ״עשוי בן חורין״; ״הרי הוא בן חורין״⁠ – הרי הוא בן חורין.

§ A baraita states that with regard to one who says: I made so-and-so my slave a freeman, or: My slave was made a freeman, or: Behold he is a freeman, in all of these cases he is a freeman as a result.

״אעשנו בן חורין״⁠ – רבי אומר: קנה, וחכמים אומרים: לא קנה. אמר רבי יוחנן: וכולן ⁠– בשטר.

If he says: I will make him a freeman, R' Yehuda HaNasi says: The slave has acquired himself, and the Rabbis say: He has not acquired himself. R' Yoḥanan says: And all of these halakhot apply only when the formulation was written in a document that was transferred to the slave. A verbal statement alone is not effective in emancipating the slave.

תנו רבנן, האומר: ״נתתי שדה פלונית לפלוני״; ״נתונה לפלוני״; ״הרי היא שלו״⁠ – הרי היא שלו. ״אתננה לפלוני״⁠ – רבי מאיר אומר: קנה; וחכמים אומרים: לא קנה. אמר רבי יוחנן: וכולן ⁠– בשטר.

Similarly, A baraita states that with regard to one who says: I gave such and such a field to so-and-so as a gift; or: This field is given to so-and-so; or: Behold it is his, in all of these cases it belongs to the recipient. If he says: I will give it to so-and-so, then R' Meir says: That person has acquired the field. And the Rabbis say: He has not acquired it. With regard to this, R' Yoḥanan also says: And all of these halakhot apply only when the formulation was written in a document that was transferred to the recipient. A verbal statement alone is not effective in transferring the field.