De libertatibus dandis liber singularis
Paulus, On the Granting of Freedom. If a slave is ordered to pay ten aurei annually for three years, and offers ten the first year, and the heir does not accept it, he will not immediately become free, for the reason that even if the heir did accept it, he would not be free.
Paulus, On Grants of Freedom. Our Emperor and his Father decided that a female slave would become free if the person in possession of her could have kept her from prostitution, but sold his right over her for money; as there is no difference whether you lead her astray and prostitute her, or whether you permit this to be done, and receive money therefor, when you can prevent it.
The Same, On Grants of Freedom. If a private individual, being compelled by the people, should manumit a slave, the latter will, nevertheless, not be free even though his owner may have given his consent; for the Divine Marcus forbade the manumission of slaves caused by the clamor of the populace. 1Likewise, a slave is not emancipated if his master states falsely that he was free, in order to avoid punishment by the magistrates, if he has no intention of manumitting him. 2With reference to those whom it is not lawful to manumit within a certain time, if they receive their freedom by a will, the time when it was executed should not be considered, but the time when the slaves were entitled to be free.