Liturgy for Bava Batra 352:1

ערב דבית דין הוא דלא בעי קנין הא בעלמא בעי קנין

only [in the case of] a guarantor appointed by a court of law is no <i>kinyan</i> required;<span class="x" onmousemove="('comment',' The reason is given infra. ');">¹</span> in all other cases, however, <i>kinyan</i> is required.

Hadran