صحيح الادب المفرد
Sahih al-Adab al-Mufrad
Part Two: Ahadith 250 to 499
باب دعاء الأخ بظهر الغيب
Chapter: Supplicating for one’s brother in his absence
Hadith Number: 487
487/624 عن ابي بكر الصديق رضي الله عنه:"إن دعوة الاخ في الله تستجاب".
It is narrated from Sayyiduna Abu Bakr Siddiq (may Allah be pleased with him): The supplication of a brother made for the sake of Allah is accepted.
تخریج الحدیث: (صحيح الإسناد)