Prescribed penalty: Qur’an 24:2 specifies a number in relation to a legal punishment; the conditions of proof and application belong to the surrounding body of law. Waiting period: Qur’an 2:228 mentions “three qurūʾ,” a term classically disputed between menstrual periods and periods of purity.
Inheritance: Sūrat al-Nisāʾ lays out specified shares, but the actual entitlement of an heir depends on family relations and the presence of other heirs.
The common feature is a legally specified measure or allocation, not that the detailed law of all three subjects follows one identical scheme.