וְעָשִׂ֥יתָ בְרִיחִ֖ם עֲצֵ֣י שִׁטִּ֑ים חֲמִשָּׁ֕ה לְקַרְשֵׁ֥י צֶֽלַע־הַמִּשְׁכָּ֖ן הָאֶחָֽד׃
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Mishneh Torah, Tefillin, Mezuzah and the Torah Scroll
If one suspended it on a staff, it is unfit, for this is not affixing it (to the doorpost). If one placed it behind the door, he has not fulfilled the precept. If he perforated the door and forced the Mezuzah into it like a nail, as a bolt is inserted in the staple-ring, it is unfit. If it was placed in a hollow of the doorpost at a depth of a hand-breadth, it is unfit. If one cut a stick, put a Mezuzah on it, attached this stick to other sticks and made of them all a doorpost, it is unfit, because the affixing of the Mezuzah preceded the erection of the doorpost.