پوستر حدیث: زيارت اهل بيت عليهم السلام

Certainly, for every Imam there is a covenant incumbent on those who accepted their Wilaya and their
followers. Without a doubt, that which completes and perfects the fulfillment of the covenant is
visitation of their graves. Those who visit them longingly as a (practical) acknowledgment
of what they long for (in their hearts), their Imams (pbut) shall certainly be their intercessors on the Day of Judgment

al-Kafi, v. 4, p. 567