Reference for Bekhorot 99:23

רב אשי שדר ליה שבסר זוזי לרב אחא בריה דרבינא בפדיון הבן שלח ליה

He replied to him: 'Let the Master send me another three zuz which were added to the biblical sela'.<span class="x" onmousemove="('comment',' Because a sela' has four denars, five sela's therefore making twenty denars. You therefore owe me another three denars to make up the twenty denars.');">¹⁸</span>

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