Reference for Gittin 134:6

אמר רבא זימנין דגאיז ליה לדיבוריה ואמר כולכון ולא אמר כל חד מינכון ואתי לאיפסולי

Raba said: Sometimes a man cuts his words short and says 'all of you' without adding, 'any one of you,' and he can afterwards come and declare the Get invalid. Raba therefore said that [they should insert the words], Write any one of you, Sign any two of you, Convey any one of you.<span class="x" onmousemove="('comment',' Omitting 'all of you'. ');">⁵</span>

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