Related for Menachot 64:11
ואמר רב יהודה אמר שמואל מצוה להניחה בתוך חללו של פתח פשיטא בשעריך אמר רחמנא ס"ד אמינא הואיל ואמר רבא מצוה להניחה
Rab Judah further said in the name of Samuel, The precept is to fix it within the space of the door.<span class="x" onmousemove="('comment',' I.e., upon that side of the door-post which faces the door but not upon the side which faces the street or the house within.');"><sup>15</sup></span> Is not this obvious? Does not the Divine Law say, And upon thy gates?<span class="x" onmousemove="('comment',' Deut. VI, 9. It must be fixed on the side where the door shuts, which is on the inside of the framework of the door-post.');"><sup>16</sup></span> - I might have thought that, since Raba stated that the [proper performance of the] precept is to fix it