or juristic and computational. Thus, knowledge of inheritance as jurisprudence is legal knowledge, whereas knowledge of inheritance calculations is technical knowledge, sought as a means to something else. The former, however, is sought for its own sake, because the objective is to deliver the rights of the heirs to them, whether or not one knows the calculations. Nevertheless, the student of knowledge needs to know inheritance calculations even if he understands its jurisprudence.

For example, if a person dies leaving behind a daughter and a full sister, knowing that the daughter receives one half and the full sister receives what remains is legal, juristic knowledge. If we say that the case is calculated on the basis of two shares: the daughter receives one half, namely one share, and the full sister receives the remainder, namely one share—this is technical, computational knowledge. But do we absolutely need it? No, it is not absolutely necessary. We may simply tell anyone: “Divide the estate into two halves: one half for the daughter and one half for the sister,” and he can divide it. Yet at times we need it when cases become numerous, particularly in the chapter of successive inheritances, as will come, if Allah wills.

The ruling on learning this knowledge is that it is a collective obligation: if a sufficient number of people undertake it, the obligation is lifted from the rest; otherwise, it becomes obligatory upon the entire Ummah, because Allah’s law in this matter cannot be implemented except through learning it.

The science of prescribed shares is among the greatest and most noble branches of knowledge, for several reasons:

First, it implements one of Allah’s obligations. After mentioning the inheritance of ascendants and descendants, Allah Most High says:

“Your parents and your children—you do not know which of them is nearest to you in benefit. This is an obligation imposed by Allah.” [al-Nisa’ 4:11]

Thus, when you learn the prescribed shares, you thereby become able to fulfill one of Allah’s obligations.

Second, inheritance is one of the limits set by Allah, the Exalted. Thus, when