[ULPIANUS libro secundo responsorum. ] §15.4.3.prDominum, qui iussit semissibus usuris seruo suo pecuniam mutuam credi, hactenus teneri quatenus iussit: nec pignoris obligationem locum habere in his praediis, quae seruus non ex uoluntate domini obligauit.
[ULPIANUS, Opinions, book 2] A master who ordered money to be lent on loan to his slave at interest of one-half percent per month is liable only to the extent that he ordered; and a pledge obligation does not take effect on those estates which the slave pledged without the consent of the master.