Shīʿa subsects, such as the Zaydī Shīʿas and Nizārī Ismāʿīlīs, don't believe in the idea of the Occultation. The groups which do believe in it differ as to which lineage of the Imamate is valid, and therefore which individual has gone into Occultation. They believe there are many signs that will indicate the time of his return. Twelver Shīʿa Muslims believe that the prophesied Mahdi and twelfth Imam, Hujjat Allah al-Mahdi, is already on Earth in Occultation, and will return at the end of time. Ṭayyibi Ismāʿīlīs and Fatimid/Bohra/Dawoodi Bohra believe the same but for their 21st Ṭayyib, At-Tayyib Abi l-Qasim, and also believe that a Da'i al-Mutlaq ("Unrestricted Missionary") maintains contact with him. Sunnī Muslims believe that the future Mahdi has not yet arrived on Earth. Ḥadīth tradition Shīʿa Muslims believe that the status of ʿAlī is supported by numerous ḥadīth, including the Hadith of the pond of Khumm, Hadith of the two weighty things, Hadith of the pen and paper, Hadith of the invitation of the close families, and Hadith of the Twelve Successors. In particular, the Hadith of the Cloak is often quoted to illustrate Muhammad's feeling towards ʿAlī and his family by both Sunnī and Shīʿa scholars. Shīʿa Muslims prefer to study and read the ḥadīth attributed to the Ahl al-Bayt and close associates, and most have their own separate ḥadīth canon. Holy Relics (Tabarruk) It is believed that the armaments and sacred items of all of the prophets, including Muhammad, were handed down in succession to the Imams of the Ahl al-Bayt. Jaʿfar al-Ṣādiq, the 6th Shīʿīte Imam, in Kitab al-Kafi mentions that "with me are the arms of the Messenger of Allah. It is not disputable." Further, he claims that with him is the sword of the Messenger of God, his coat of arms, his Lamam (pennon) and his helmet. In addition, he mentions that with him is the flag of the Messenger of God, the victorious. With him is the Staff of Moses, the ring of Solomon, son of David, and the tray on which Moses used to offer his offerings. With him is the name that whenever the Messenger of God would place it between the Muslims and pagans no arrow from the pagans would reach the Muslims. With him is the similar object that angels brought. Al-Ṣādiq also narrated that the passing down of armaments is synonymous to receiving the Imamat