Reference for Gittin 151:12

תנו רבנן אמר לה בפני שנים הרי זה גיטך על מנת שתשמשי את אבא ב' שנים וחזר ואמר לה בפני שנים הרי זה גיטך על מנת שתתני לי מאתים זוז לא ביטל דברי האחרון את הראשון רצתה משמשתו רצתה נותנת לו מאתים זוז

and she has the option of either waiting on the father or giving the husband the two hundred <i>zuz</i>. If, however, he said to her in the presence of two witnesses, Here is your Get on condition that you give me two hundred <i>zuz</i>, and he subsequently said to her in the presence of two witnesses, Here is your Get on condition that you give me three hundred <i>zuz</i>, the second statement nullifies the first, nor can one of the first two witnesses and one of the second combine to form a pair.<span class="x" onmousemove="('comment',' To testify that there was a certain condition attached to the Get though not inserted in writing. ');">⁹</span>

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