A leader who draws people nearer to righteousness is a grace of God. Imamate in Shi’i Islam considers it necessary to have a guide who will lead the Muslim society after the Prophet’s death to present true Islam. This guide is appointed by God; he possesses qualities of piety, knowledge, wisdom, and infallibility. While Part IV of this series verified that the Shi‘a understanding of Imamate is compatible with the Qur’an, Part V studied the group of verses that refer to the profound concept of witness, including his roles and merits, and that it is none other than Imam Ali who possessed those qualities. This part offers the authentic hadiths that refer to the legitimacy of Imam Ali’s leadership, namely the Hadith of Manzilah, Hadith of Dār, Hadith of Tayr, Hadith of Wilāya, Hadith of Ghadir, Hadith of Safinah, and the Hadith of the Stars.