Halakhah for Menachot 65:10
אמר ר"ה בריה דרב נתן לעולם כרבי יוסי
R'Zera said in the name of R'Mattena who said it in the name of Samuel, The proper performance of the precept is to fix it at the beginning of the upper third of the door-post. But R'Huna said, It must be raised one handbreadth from the ground and it must be one handbreadth away from the lintel, otherwise the whole of the door-post is valid for the mezuzah. An objection was raised: It must be raised one handbreadth from the ground and it must be one handbreadth away from the lintel, otherwise the whole of the door-post is valid for the mezuzah. So R'Judah. R'Jose says, It is written, And thou shalt bind them,<span class="x" onmousemove="('comment',' Deut. VI, 8.');"><sup>12</sup></span> and And thou shalt write them:<span class="x" onmousemove="('comment',' Ibid. 9.');"><sup>13</sup></span> as the binding [of the tefillin] is high up,<span class="x" onmousemove="('comment',' At the top of the head; v. infra 37a.');"><sup>14</sup></span> so the writing must be placed high up.<span class="x" onmousemove="('comment',' At the top of the door-post, close to the lintel.');"><sup>15</sup></span> Now according to R'Huna this is well, for he agrees with R'Judah; but with whom does Samuel agree? Neither with R'Judah nor with R'Jose! - R'Huna the son of R'Nathan answered, Indeed he agrees with R'Jose,