A slave who takes on debt without his master's permission

Al-Hasan (may Allah have mercy on him) said: If a slave trades without his master's permission and falls into debt, and is then freed, he is indeed to be sold for that debt.

Al-Zuhri (may Allah have mercy on him) said: If a slave buys and sells without his master's permission, nothing falls upon his master; all of it is the slave's responsibility, and when he is freed all of it is binding on him.

Hammad (may Allah have mercy on him) was asked: What if a slave buys and sells without his master's permission and is then freed? He said: Nothing at all falls upon the master, and the creditors' debt will rest on the slave's neck when he is freed.