Responsa for Bava Kamma 208:10
אמר רב נחמן לא קשיא כאן שהודה כאן שלא הודה
so that were the robber to die<span class="x" onmousemove="('comment',' Before having paid the Fifth. ');"><sup>16</sup></span> the heirs would have to pay it. We have also learnt: IF HE REFUNDED TO HIM FOR THE PRINCIPAL AND TOOK AN OATH REGARDING THE FIFTH, HE WOULD HAVE TO PAY HIM A FIFTH ON TOP OF THE FIFTH, similarly proving that the Fifth is a civil liability. It was moreover taught to the same effect: If one man robbed another but took an oath [that he did not do so] and [after admitting his guilt he] died, the heirs would have to pay the principal and the Fifth, though they would be exempt from the trespass offering. Now, since heirs are subject to pay the Fifth which their father would have had to pay, [it surely proves that the Fifth is a civil liability which has to be met by heirs]. But a contradiction could be raised [from the following]: 'I would still say that the case where an heir has not to pay the Fifth for a robbery committed by his father is only where neither he nor his father took an oath.<span class="x" onmousemove="('comment',' Falsely. ');"><sup>17</sup></span>
Teshuvot Maharam
A. Even A's producing a written consent from the widow would be of no avail unless he can also prove through witnesses that the widow instructed and ordered the writing of the instrument. Should he not be able to do so, he will have to remove the building from the widow's premises and pay her rent for the time his building stood thereon. Should A produce such witnesses, his contract with the widow's son and son-in-law will be non-voidable even though A did not yet pay the rent for the full ten years. Although the widow did not personally instruct her son and son-in-law to rent her premises to A, but sent such instructions in writing — such manner of sending instructions not being acceptable in talmudic law — nevertheless the son and son-in-law became the widow's agents, since it is the usual custom of merchants to accept as valid written instruments, and since the custom of merchants prevails in business transactions.
This Resp. is addressed to R. Eliezer ha-Kohen, and R. Eliezer.
SOURCES: Pr. 698.