حَدَّثَنَا عَلِيُّ بْنُ مُحَمَّدٍ، حَدَّثَنَا وَكِيعٌ، عَنْ هِشَامٍ، صَاحِبِ الدَّسْتَوَائِيِّ عَنْ قَتَادَةَ، عَنْ سَعِيدِ بْنِ الْمُسَيَّبِ، عَنْ سَعْدِ بْنِ عُبَادَةَ، قَالَ قُلْتُ يَا رَسُولَ اللَّهِ أَىُّ الصَّدَقَةِ أَفْضَلُ قَالَ ‏"‏ سَقْىُ الْمَاءِ ‏"‏ ‏.‏

It was narrated that Sad bin Ubadah said: "I said: 'O Messenger of Allah, what charity is best?' He said: 'Giving water to drink.'" Translation Not Available

Book Ref: Sunan Ibn Majah Book 33 Hadith 3684
Web Ref:  Sunan Ibn Majah Vol 5 Book 33 Hadith 3684