[ULPIANUS libro quadragesimo secundo ad Sabinum. ] §21.2.31.prSi ita quis stipulanti spondeat 'sanum esse, furem non esse, uispellionem non esse' et cetera, inutilis stipulatio quibusdam uidetur, quia si quis est in hac causa, impossibile est quod promittitur, si non est, frustra est.
[ULPIAN, On Sabinus, Book Forty-Two] If anyone should promise a stipulator in this manner: 'that the slave is healthy, is not a thief, is not a corpse-carrier,' and so forth, the stipulation seems to some to be useless; because if the slave is in this condition, what is promised is impossible, and if he is not, it is in vain.
sed ego puto uerius hanc stipulationem 'furem non esse, uispellionem non esse, sanum esse' utilem esse: hoc enim continere, quod interest horum quid esse uel horum quid non esse.
But I think it is more correct that this stipulation 'that he is not a thief, is not a corpse-carrier, is healthy' is useful: for this covers what interest there is in his being or not being any of these.
sed et si cui horum fuerit adiectum 'praestari', multo magis ualere stipulationem: alioquin stipulatio quae ab aedilibus proponitur inutilis erit, quod utique nemo sanus probabit.
Nay, even if 'to be guaranteed' should be added to any of these, the stipulation is much more valid; otherwise, the stipulation proposed by the aediles will be useless, which surely no sane person will approve.