2. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad from Ali ibn al-Hakam from Husayn ibn ‘Uthman from ibn Muskan from Aban ibn Taghlib who has said the following: “I once heard abu ‘Abd Allah عليه السلام, say, ‘Ali عليه السلام, placed bricks on the grave of the Holy prophet.’ I then asked, ‘If one places tiles on the grave is it harmful to the deceased?’ He (the Imam) said, ‘No, it is not harmful.’”