كتاب الصلاة
2  
The Book of Prayer
Muslim added:
"during Salat (prayer)".
زَادَ مُسْلِمٌ { فِي اَلصَّلَاةِ } .‏

Sunnah.com reference : Book 2, Hadith 87
English translation : Book 2, Hadith 0
Arabic reference : Book 2, Hadith 222