وَ قَالَ ع مَنْ عَمِلَ مِنَ الْمُسْلِمِينَ عَنْ مَيِّتٍ عَمَلًا صَالِحاً أُضْعِفَ لَهُ أَجْرُهُ وَ نَفَعَ اللَّهُ بِهِ الْمَيِّتَ.
English translationBab Ul Qaim Publications
Hadith.556 - Imam (as) said: "Whoever from among the Muslims performs a good deed on behalf of a deceased person, their reward will be multiplied, and Allah (swt) will benefit the deceased through it."
Translation: Bab Ul Qaim Publications·Thaqalayn link·The Arabic above is the original.