Sahih
Muslim
صحيح مسلم
13
The Book of Fasting
كتاب الصيام
Chapter 27: Making up fasts on behalf of the deceased
باب قَضَاءِ الصِّيَامِ عَنِ الْمَيِّتِ
Sahih Muslim 1149 d
This hadith has been narrated on the authority of Sufyan with the same chain of transmitters in which it is said
" Fasting of two months."وَحَدَّثَنِيهِ إِسْحَاقُ بْنُ مَنْصُورٍ، أَخْبَرَنَا عُبَيْدُ اللَّهِ بْنُ مُوسَى، عَنْ سُفْيَانَ، بِهَذَا الإِسْنَادِ وَقَالَ صَوْمُ شَهْرَيْنِ .
Grade: Sahih