Reference for Eruvin 30:2
<big><strong>גמ׳</strong></big> תניא ר' מאיר אומר כל דבר שיש בו רוח חיים אין עושין אותו לא דופן לסוכה ולא לחי למבוי לא פסין לביראות ולא גולל לקבר משום רבי יוסי הגלילי אמרו אף אין כותבין עליו גיטי נשים
or as a side-post for an alley, [or as one of the] partitions for watering stations or as a covering for a grave.<span class="x" onmousemove="('comment',' If it was used, the wall, the side-post or the partition is invalid and the covering remains insusceptible to levitical uncleanness.');"><sup>3</sup></span> In the name of R'Jose the Galilean it was laid down: Women's bills [of divorce] also may not be written on it.<span class="x" onmousemove="('comment',' Suk. 23a. rpx');"><sup>4</sup></span> What is R'Jose the Galilean's reason? - Because it was taught: [From the Scriptural expression of] 'letter'<span class="x" onmousemove="('comment',' Deut. XXIV, 1. 'book', 'letter' or 'scroll'.');"><sup>5</sup></span>