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:14109a –
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السيوطي:١٤١٠٩a –

"دَعْوَتَان لَيسَ بَيْنَهُمَا وَبَيْنَ اللَّه حجَابٌ: دَعْوَةُ الْمَظلُوم، وَدَعْوَةُ الْمَرْءِ لأَخِيهِ بِظَهْرِ الْغَيْب".  

[طب] الطبرانى في الكبير عن ابن عباس

See similar narrations below:

Collected by Ṭabarānī
tabarani:11232 – [Chain 1] ʿAlī b. ʿAbd al-ʿAzīz > ʿAbd al-Ghaffār b. ʿAbdullāh al-Mawṣilī > al-Muʿāfá b. ʿImrān [Chain 2] Muḥammad b. ʿAbdullāh al-Ḥaḍramī > Muḥammad b. al-Mundhir al-Ḥizāmī > Maʿn b. ʿĪsá > ʿAbd al-Raḥman b. Abū Bakr al-Mulaykī > Ibn Abū Mulaykah > Ibn ʿAbbās

[Machine] The Messenger of Allah ﷺ said, "There are two types of supplications that have no barrier between them and Allah: the supplication of the oppressed and the supplication of a person for his brother in his absence."  

الطبراني:١١٢٣٢ – حَدَّثَنَا عَلِيُّ بْنُ عَبْدِ الْعَزِيزِ ثنا عَبْدُ الْغَفَّارِ بْنُ عَبْدِ اللهِ الْمَوْصِلِيُّ ثنا الْمُعَافَى بْنُ عِمْرَانَ ح وَحَدَّثَنَا مُحَمَّدُ بْنُ عَبْدِ اللهِ الْحَضْرَمِيُّ ثنا مُحَمَّدُ بْنُ الْمُنْذِرِ الْحِزَامِيُّ ثنا مَعْنُ بْنُ عِيسَى قَالَا ثنا عَبْدُ الرَّحْمَنِ بْنُ أَبِي بَكْرٍ الْمُلَيْكِيُّ عَنِ ابْنِ أَبِي مُلَيْكَةَ عَنِ ابْنِ عَبَّاسٍ قَالَ

قَالَ رَسُولُ اللهِ ﷺ دعوتانِ لَيْسَ بَيْنَهُمَا وَبَيْنَ اللهِ حِجَابٌ دَعْوَةُ الْمَظْلُومِ وَدَعْوَةُ الْمَرْءِ لِأَخِيهِ بِظَهْرِ الْغَيْبِ