Reference for Bava Kamma 205:7
אמרי התם אמנה הואי ולא משכיה רב כהנא לכיתנא ורב לטעמיה דאמר רב עושין אמנה בפירות ואין עושין אמנה בדמים:
IF HE REFUNDED TO HIM THE PRINCIPAL AND TOOK AN OATH<span class="x" onmousemove="('comment',' v. p. 598. n. 11. ');"><sup>21</sup></span> REGARDING THE FIFTH,<span class="x" onmousemove="('comment',' Lev. V, 24. ');"><sup>18</sup></span> HE WOULD HAVE TO PAY HIM A FIFTH ON TOP OF THE FIFTH AND SO ON UNTIL THE PRINCIPAL BECOMES REDUCED TO LESS THAN THE VALUE OF A <i>PERUTAH</i>. SO ALSO IS THE CASE REGARDING A DEPOSIT, AS IT IS STATED: IN THAT WHICH WAS DELIVERED HIM TO KEEP, OR IN FELLOWSHIP, OR IN A THING TAKEN AWAY BY VIOLENCE, OR HATH DECEIVED HIS NEIGHBOUR, OR HATH FOUND THAT WHICH WAS LOST AND LIETH CONCERNING IT AND SWEARETH FALSELY,<a rel="footnote" href="#103b_1"><sup>1</sup></a> HE HAS TO PAY THE PRINCIPAL AND THE FIFTH AND BRING A TRESPASS OFFERING.<a rel="footnote" href="#103b_2"><sup>2</sup></a>