[IULIANUS libro quinquagensimo quinto digestorum. ] §2.11.13.prQuotiens seruus iudicio sistendi causa ut ipse litigaturus uel ab alio stipulatur uel ipse promittit: nec committitur stipulatio nec fideiussores tenentur, quia seruus conueniri uel conuenire non potest.
[JULIANUS, Digest, book 55] Whenever a slave, with a view to being produced in court as if he himself were about to litigate, either stipulates with another or himself promises: neither is the stipulation forfeited, nor are the sureties bound, because a slave can neither be sued nor sue.