The Arabic, ``ZIKR'' which is usually translated to, mention remembering, memory, recital, or invocation of God, has a wide variety of meanings. It also means having a great deal of information in various fields of knowledge.
Many of the commentators have understood, ``AHL-AL-ZIKR'' to be the elders and the learned. Some commentators have taken it to be the doctors of the Bible and the Gospel, or those who are well verses in the Scriptures.
On this basis those who are well versed in Qurän; they too are the, ``AHL-AL-ZIKR''; and the best and greatest among them are Mohammad himself, his daughter Fatima, Imam Ali his soul and self, and his two grand sons, Imam Hasan and Imam Husain (AS).