The task is in charge to the Apostle is very heavy and could not be borne by ordinary people except those who have certain properties. Mandatory nature of the Apostles that there are 4 (four), namely:

 1. Siddiq (really) Explained in (QS. Maryam: 50)
 2. Amanah (can be believed) Described in (QS. Maryam: 54)
 3. Tabligh (convey) Described in (QS. Al-Maidah: 87 and Qs. Al
    Ahzab; 39)
 4. fathanah (intelligent) (QS. An-Nahl: 44)

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