Is the contract of *Kitabah* (manumission by installment) valid when executed by an insane person or a minor child?

Primary text

The contract of *Kitabah* is not valid when executed by an insane person or a minor child, whether they are attempting to free their own slave or if their master attempts to contract *Kitabah* with them. This is because they lack the capacity to effect legal transactions. If the master is a mature individual, his *Kitabah* of his insane or minor slave is neither valid nor void (*fasid*). However, if the master states, "If you deliver what is due to me, then you are free," and they deliver, they are freed by the condition (*sifah*), not by *Kitabah*. If the master did not state this condition, they are not freed. This view is narrated by Abu Bakr.