Reference for Bava Batra 287:9

אמר מר זוטרא הני תלת מילי שוינהו רבנן כהלכתא בלא טעמא חדא הא אידך דאמר רב יהודה אמר שמואל הכותב כל נכסיו לאשתו לא עשאה אלא אפוטרופא אידך דאמר רב מנה לי בידך תנהו לפלוני במעמד שלשתן קנה:

for himself<span class="x" onmousemove="('comment',' To indicate to his son that the house was not to become his property. ');">²¹</span> a sandal.<span class="x" onmousemove="('comment',' The sandal, like any of the other objects mentioned above is regarded for this purpose as a store. ');">²²</span> R. Ashi married his son and hung up<span class="x" onmousemove="('comment',' In the house where the marriage took place. ');">²⁰</span> for himself<span class="x" onmousemove="('comment',' To indicate to his son that the house was not to become his property. ');">²¹</span> a jug of oil.<span class="x" onmousemove="('comment',' Cf. n. 10 ');">²³</span> Mar Zutra said: The following three things have [been] enacted [by] the Rabbis as fixed law without [adducing any] reason. One [is] this.<span class="x" onmousemove="('comment',' The ruling just mentioned, that a son acquires the ownership of a house of his father in which his marriage took place, even if the father did not explicitly present it to him. ');">²⁴</span> The other [is that] which Rab Judah said in the name of Samuel, [namely that]. a [dying] man [who] gave all his property to his wife, in writing. [thereby] only appointed her adminstratrix.<span class="x" onmousemove="('comment',' V. supra 131b. ');">²⁵</span> [.And the] third<span class="x" onmousemove="('comment',' Lit. 'other'. ');">²⁶</span> [is that] which Rab had stated: [If one said] 'You owe me a <i>maneh</i>; give it to X', in the presence of the three parties,<span class="x" onmousemove="('comment',' I.e., the debtor, the creditor, and X, the assignee. ');">²⁷</span> [X] acquires possession.<span class="x" onmousemove="('comment',' Though there were no proper witnesses and no legal form of acquisition, the transfer of the claim is valid. This rabbinic law, which is declared to be arbitrary and based on tradition alone, recognises the transfer of claims to a third party, though this is not provided for by Biblical Law. ');">²⁸</span>

Jastrow