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

ذِكْرُ دُعَاءِ الْمُصْطَفَى ﷺ لِسَعْدٍ بِاسْتِجَابَةِ دُعَائِهِ أَيَّ وَقْتٍ دَعَاهُ

ibnhibban:6990 – Muḥammad b.

[Machine] The Messenger of Allah ﷺ said, "O Allah, answer his prayer when he calls upon You, meaning Sa'd."  

ابن حبّان:٦٩٩٠ – أَخْبَرَنَا مُحَمَّدُ بْنُ إِسْحَاقَ الثَّقَفِيُّ حَدَّثَنَا الْحَسَنُ بْنُ عَلِيٍّ الْحُلْوَانِيُّ حَدَّثَنَا جَعْفَرُ بْنُ عَوْنٍ حَدَّثَنَا إِسْمَاعِيلُ بْنُ أَبِي خَالِدٍ عَنْ قَيْسٍ قَالَ سَمِعْتُ سَعْدًا يَقُولُ

قَالَ رَسُولُ اللَّهِ ﷺ «اللَّهُمَّ اسْتَجِبْ لَهُ إِذَا دَعَاكَ يَعْنِي سَعْدًا »  

See similar narrations below:

Collected by Ḥākim, Suyūṭī
hakim:6118 – Abū al-Faḍl al-Ḥasan b. Yaʿqūb al-ʿAdl > Muḥammad b. ʿAbd al-Wahhāb al-ʿAbdī > Jaʿfar b. ʿAwn > Ismāʿīl b. Abū Khālid > Qays b. Abū Ḥāzim > Saʿd

[Machine] To me, the Messenger of Allah ﷺ said, "O Allah, respond to him when he calls upon You."  

الحاكم:٦١١٨ – أَخْبَرَنَا أَبُو الْفَضْلِ الْحَسَنُ بْنُ يَعْقُوبَ الْعَدْلُ ثَنَا مُحَمَّدُ بْنُ عَبْدِ الْوَهَّابِ الْعَبْدِيُّ ثَنَا جَعْفَرُ بْنُ عَوْنٍ ثَنَا إِسْمَاعِيلُ بْنُ أَبِي خَالِدٍ عَنْ قَيْسِ بْنِ أَبِي حَازِمٍ قَالَ سَمِعْتُ سَعْدًا يَقُولُ قَالَ

لِي رَسُولُ اللَّهِ ﷺ «اللَّهُمُ اسْتَجِبْ لَهُ إِذَا دَعَاكَ»  

هَذَا حَدِيثٌ صَحِيحُ الْإِسْنَادِ وَلَمْ يُخَرِّجَاهُ صحيح
suyuti:5-59b – Saʿd > al-Nabi ﷺ
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السيوطي:٥-٥٩b –

"عَنْ سَعْدٍ: أَنَّ النَّبِىَّ ﷺ قَالَ: اللَّهُمَّ اسْتَجِبْ لسَعْدٍ إِذَا دَعَاكَ".  

[كر] ابن عساكر في تاريخه