Reference for Yoma 22:10
תניא אידך בית הכנסת ובית השותפין ובית האשה מטמאין בנגעים פשיטא מהו דתימא (ויקרא יד, לה) ובא אשר לו הבית לו ולא לה לו ולא להן קמ"ל
They are disputing only concerning doorways the [whole] height of which is ten, with the posts three in height, but with a width less than four handbreadths, space however being left to extend it to four handbreadths.<span class="x" onmousemove="('comment',' Within the ten handbreadths, the minimum required height of the doorway.');"><sup>13</sup></span> R'Meir holds one may extend<span class="x" onmousemove="('comment',' By legal fiction. As long as the doorway starts on a breadth of four by three, allowing space for continued dimension up to ten, we look upon it as continuing in the same size, hence as entitled to the designation 'door', with the implication of being subject to the law of mezuzah');"><sup>14</sup></span>