Halakhah for Menachot 65:7
א"ר זירא אמר רב מתנא אמר שמואל מצוה להניחה בתחלת שליש העליון ורב הונא אמר מגביה מן הקרקע טפח ומרחיק מן הקורה טפח וכל הפתח כולו כשר למזוזה
it is invalid. But this cannot be for when R'Isaac B'Joseph came [from Palestine] he reported that all the mezuzoth in Rabbi's house were fixed in the manner of a bolt, and also that the door through which Rabbi used to enter the House of Study had no mezuzah! - This is no contradiction, for in the one case it was attached horizontally,<span class="x" onmousemove="('comment',' In which case it is invalid.');"><sup>8</sup></span>
Sefer HaChinukh
It is from the roots of the commandment that it be a memory device for a person about faith in God every time that he comes into his home and [when] he leaves [it], and like I wrote about the matter of tefillin. And [it is] like the matter that they, may their memory be blessed, wrote about this commandment (Menachot 33a), "Rabbi Zira said that Rav Matnah said that Shmuel said, 'It is a commandment to place it in the top third.' Rabbah [Rava] said, 'It is a commandment to place it in the handbreadth adjacent to the public domain.' What is the reason? The Rabbis said, 'So that one will be met by the commandment immediately'" (Menachot 33b).
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