Reference for Chullin 116:1

הני תמרי דכדא לבתר תריסר ירחי שתא שריין

that dates which were kept in a vessel [and which became wormy]<span class="x" onmousemove="('comment',' But it is not known whether the worms entered the dates whilst yet in growth or only after they were plucked from the tree.');">¹</span>

Jastrow