On Miscellaneous Topics
Man Lā Yaḥḍuruh al-Faqīh|Volume 1|Book 1|Chapter 28
وَقَالَ اَلصَّادِقُ عَلَيْهِ اَلسَّلاَمُ: «كُلُّمَا جُعِلَ عَلَى اَلْقَبْرِ مِنْ غَيْرِ تُرَابِ اَلْقَبْرِ فَهُوَ ثِقْلٌ عَلَى اَلْمَيِّتِ.
Imam Jafar ibn Muhammad Al-Sadiq عليه السلام said: "Whatever is placed on the grave that is not from the soil of the grave itself is a burden upon the deceased."
- Ṣaḥīḥ al-Faqīh