Abu Musa al-Saffar (may Allah have mercy on him) narrates: I asked Sayyiduna Ibn Abbas (may Allah be pleased with them both) (or he was asked): "Which charity is the most excellent?" He said that the Prophet (peace and blessings be upon him) was asked which charity is the most excellent, and he (peace and blessings be upon him) said: "Water."
Then I said: "O Prophet of Allah (peace and blessings be upon him), which charity is the most excellent?" He (peace and blessings be upon him) said: "Water. Do you not see that when the people of the Fire call upon the people of Paradise for help, they will say: 'Pour upon us some water, or some of what Allah has provided you'?"
Hadith Referenceالمعجم الأوسط / باب الألف / 1011
Hadith Gradingمحدثین:إسناده ضعيف لجهالة موسى بن المغيرة
Hadith Takhrij«قال الهيثمي: فيه موسى بن المغيرة وهو مجهول «مجمع الزوائد ومنبع الفوائد، ج 3، ص 131»» «أخرجه أبو يعلى فى «مسنده» برقم: 2673، والطبراني فى «الأوسط» برقم: 6192»