Rafi'ah Abu Musa al-Saffar (may Allah have mercy on him) narrates: I asked Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both): "Which charity is best?" He said: "I asked the Messenger of Allah (peace and blessings be upon him): 'Which charity is best?' He (peace and blessings be upon him) said: 'Water.' I said: 'O Prophet of Allah, which charity is best?' He (peace and blessings be upon him) said: 'Water. Do you not see that when the people of the Fire call to the people of Paradise for help, they will cry out: "Pour upon us some water or some of what Allah has provided for you"?'"
Imam al-Tabarani (may Allah have mercy on him) said: "This hadith is not narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) except with this chain, and Muhammad bin Musa al-Harashi is alone in it."
Hadith Referenceالمعجم الأوسط / باب الميم / 6192
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: 1011»