The Merits of the Ziyārah of the Believers and How it Should be Performed

8. My father and Muḥammad ibn Ḥasan both narrated to me from Ḥasan ibn Mattīl, from Sahl ibn Ziyād, from Muḥammad ibn Sinān, from Isḥāq ibn ‘Ammār, who said: I asked Abal Ḥasan (Imam Kāżim عليه السلام), “Do the believers know who visits their graves?” Imam عليه السلام replied, “Yes, and they enjoy the company of their visitors as long as they are next to them but as soon as they leave the grave, they (the believers in the grave) will feel a sudden loneliness.”