´It was narrated that Abu Hurairah said:` "The Messenger of Allah said: 'The rewards of the good deeds that will reach a believer after his death are: Knowledge which he taught and spread; a righteous son whom he leaves behind; a copy of the Qur'an that he leaves as a legacy; a mosque that he built; a house that he built for wayfarers; a canal that he dug; or charity that he gave during his lifetime when he was in good health. These deeds will reach him after his death.'"
Hadith Referenceسنن ابن ماجه / (أبواب كتاب السنة) / 242
Hadith Gradingالألبانی:حسن | زبیر علی زئی:ضعيف, إسناده ضعيف, الوليد بن مسلم: مدلس, وكان يدلس تدليس التسوية ولم يصرح بالسماع المسلسل ومرزوق بن أبي الھذيل: لين الحديث (تقريب: 6554) أي ضعيف و ضعفه الجمھور, انوار الصحيفه، صفحه نمبر 383