According to the consensus of classical Islamic scholarship, the concept of Bequest (Al-Wasiyyah) is a voluntary, testamentary disposition allowing a Muslim to allocate up to a maximum of one-third of their net estate to beneficiaries who are not legally entitled to a mandatory share of inheritance (Mirath). Jurists like Al-Qurtubi, referencing the definitive hadith of Sa'd ibn Abi Waqqas, established that this discretionary one-third portion complements the fixed, divine system of inheritance detailed in Surah An-Nisa'. The linguistic analysis from sources like Lisān al-'Arab shows the root 'waṣā' means 'to enjoin' or 'instruct,' highlighting the Wasiyyah's role as a final, binding instruction for charity, settling debts, or supporting non-heir relatives and adopted children. The synthesis of Quranic verses (e.g., 2:180, 4:11-12) and Prophetic traditions ('No bequest for an heir') creates a balanced and just system of estate distribution. Contemporary Islamic scholars and financial planners affirm this classical framework as the foundation for modern Sharia-compliant estate planning, ensuring both divine obligations and personal charitable wishes are fulfilled.