Reference for Shabbat 122:7

אלא לענין גניזה ת"ש * היה כתוב על ידות הכלים ועל כרעי המטה יגוד ויגנזנו

and the amulets are [henceforth] approved. If three amulets [are successful for] three people, each [being efficacious] once, the practitioner is [henceforth] approved, but not the amulets. If one amulet [is efficacious] for three men, the amulet is approved but not the practitioner. [But] R. Papa propounded: What if three amulets [are efficacious] for one person?<span class="x" onmousemove="('comment',' V. p. 286, n. 7. ');">⁷</span>

Jastrow