[ULPIANUS libro trigesimo secundo ad edictum. ] §18.7.1.prSi fuerit distractus seruus, ne aliquo loci moretur, qui uendidit in ea condicione est, ut possit legem remittere, ipse Romae retinere.
[ULPIANUS in the thirty-second book on the Edict.] If a slave has been sold on condition that he should not remain in a certain place, the seller is in a position to waive the condition and to retain him in Rome himself.
quod et Papinianus libro tertio respondit: propter domini enim, inquit, securitatem custoditur lex, ne periculum subeat.
This is what Papinian also answered in his third book; for, he says, the condition is maintained for the safety of the master, lest he should undergo danger.