Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
suyuti:3751a –
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السيوطي:٣٧٥١a –

"أفضلُ الدعاء دعوةُ غائبٍ لغائب".  

[ش] ابن أبى شيبة عن ابن عمرو

See similar narrations below:

Collected by Suyūṭī
suyuti:3150a –

The Prophet ﷺ said: The supplication which gets the quickest answer is that made by one distant Muslim for another. (Using translation from Abū Dāʾūd 1535)   

السيوطي:٣١٥٠a –

"أسْرعُ الدُّعاءِ إِجابة دعْوَةُ غائبٍ لِغائبٍ ".  

[خ] البخاري في الأدب، [د] أبو داود [طب] الطبرانى في الكبير والخرائطى في مكارم الأخلاق عن ابن عمرو