Is it permissible for a Muslim

Q: One of the Imams said during the Friday Khutbah (sermon) that putting a mark on the gravestone in order to distinguish it like paint or tying some rope or metal bars in one of the gravestones is prohibited. My father (may Allah be Merciful with him) died and I put some paint on one of the gravestones in order to distinguish it when I visit it. Moreover, this Imam refused to perform Salah on rugs distributed by the Ministry of Hajj and Endowments and forbade them in Masjids saying that they had crosses on them. What is your opinion in this regard? May Allah protect you.

(Part No. 6; Page No. 185)  A: There is no blame on marking graves as long as the marks do not contradict Shari`ah (Islamic law) like paint on one of the gravestones. However, writing on the grave or the gravestone is prohibited as the Prophet (peace be upon him) forbade that. It is reprehensible to perform Salah on rugs that have pictures of crosses unless the shape is obliterated by dying, sewing, or the like.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.