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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:27097a –
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السيوطي:٢٧٠٩٧a –

" يَا سَعْدُ: أَلاَ أدُلُّكَ عَلَى صَدَقَة خَفيفَة مُؤْنَتُهَا، عَظيمٍ أجْرُهَا: تَسْقِى الْمَاءَ".  

[طب] الطبرانى في الكبير عن سعد بن عبادة

See similar narrations below:

Collected by Ṭabarānī
tabarani:5385 – Muḥammad b. ʿUthmān b. Abū Shaybah > Ḍirār b. Ṣurad Abū Nuʿaym al-Ṭaḥḥān > ʿAbd al-ʿAzīz b. Muḥammad > ʿUmārah b. Ghaziyyah > Ḥumayd b. Abū al-Ṣanʿah > Saʿd b. ʿUbādah

[Machine] "That the Messenger of Allah ﷺ said to him, 'O Saad, should I not guide you to a charity whose provision is immense? He said, 'Yes.' He said, 'To give water to drink.' So Saad gave water to drink."  

الطبراني:٥٣٨٥ – حَدَّثَنَا مُحَمَّدُ بْنُ عُثْمَانَ بْنِ أَبِي شَيْبَةَ ثنا ضِرَارُ بْنُ صُرَدَ أَبُو نُعَيْمٍ الطَّحَّانُ ثنا عَبْدُ الْعَزِيزِ بْنُ مُحَمَّدٍ عَنْ عُمَارَةَ بْنِ غَزِيَّةَ عَنْ حُمَيْدِ بْنِ أَبِي الصَّنْعَةِ عَنْ سَعْدِ بْنِ عُبَادَةَ

أَنَّ رَسُولَ اللهِ ﷺ قَالَ لَهُ «يَا سَعْدُ أَلَا أَدُلُّكَ عَلَى صَدَقَةٍ يَسِيرَةٍ مُؤْنَتُهَا عَظِيمٍ أَجْرُهَا؟» قَالَ بَلَى قَالَ «تَسْقِي الْمَاءَ» فَسَقَى سَعْدٌ الْمَاءَ