Reference for Kiddushin 22:10
אי אמרת בשלמא דיהב לה דינר היינו דמגרעה ואזלה עד פרוטה אלא אי אמרת דיהב לה פרוטה מפרוטה מי מגרעה ודלמא ה"ק רחמנא היכא דיהב לה דינר תיגרע עד פרוטה היכא דיהב לה פרוטה לא תיגרע כלל
but what is a sela'? Half a zuz, for it happens that people call half a zuz 'istira'.<span class="x" onmousemove="('comment',' A silver coin, equal to the provincial sela' = 1/2 zuz.');"><sup>24</sup></span> R'Simeon B'Lakish said: Beth Shammai's reason is in accordance with Hezekiah. For Hezekiah said: Scripture saith, then shall he let her be redeemed<span class="x" onmousemove="('comment',' Ex. XXI, 8; v. infra 14b, ');"><sup>25</sup></span> - this teaches that she deducts from her redemption [money] and goes out [free]. Now, if you say that he [the master] gave her a denar,<span class="x" onmousemove="('comment',' In buying her. The money given for a Hebrew maidservant may also be regarded as kiddushin, since in virtue thereof he can take her to wife; v. Ex. ibid.');"><sup>26</sup></span> it is well: hence she can go on deducting until a perutah. But if you say that he gave her a perutah: what can be deducted from a perutah?<span class="x" onmousemove="('comment',' Seeing that it is the smallest coin.');"><sup>27</sup></span> But perhaps Scripture ordered thus: if he gave her a denar, she can go on deducting until a perutah; [but] if he gave her a perutah, she cannot deduct at all?