Sa‘d b. ‘Ubada told God’s messenger that Umm Sa'd had died and asked him what form of sadaqa was best. When he replied that water was best, he dug a well and said it was for Umm Sa'd. Abu Dawud and Nasa’i transmitted it.
Hadith Referenceمشكوة المصابيح / كتاب الزكاة / 1912
Hadith Gradingالألبانی:ضَعِيف | زبیر علی زئی:حسن
Hadith Takhrij´تحقيق و تخريج: محدث العصر حافظ زبير على زئي رحمه الله` «حسن، رواه أبو داود (1678) والنسائي (254/6ح 3694) و للحديث طرق کثيرة وھو حديث حسن.»