Jami' al-Saghir / Jam' al-Jawami' (al-Suyuti) 13146a
"ثلَاثَةٌ لَا يَرُدُّ اللَّه دُعَاءَهُمْ: الذَّاكِرُ اللَّه كَثِيرًا، ودَعْوَةُ الْمَظْلُومِ، والإِمامُ الْمُقْسِطُ".
Notes
[هب] البيهقى في شعب الإيمان عن أَبى هريرة ؓ
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No grade is recorded for this wording. Ask what scholars say about its grade