It is narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Whoever fasts one day in the path of Allah, Allah Almighty will keep him away from the Fire by a distance of seventy years."
Imam al-Tabarani (may Allah have mercy on him) said: "No one narrated this hadith from Zayd bin Aslam (may Allah have mercy on him) except his son Abd al-Rahman (may Allah have mercy on him) and Hisham bin Sa'd (may Allah have mercy on him), while al-Layth bin Sa'd (may Allah have mercy on him) is alone in narrating it from Hisham bin Sa'd (may Allah have mercy on him)."
Hadith Referenceالمعجم الأوسط / باب الميم / 6275
Hadith Takhrij«أخرجه الترمذي فى «جامعه» برقم: 1622، وابن ماجه فى «سننه» برقم: 1718، وسعيد بن منصور فى «سننه» برقم: 2422، وأحمد فى «مسنده» برقم: 8811، والبزار فى «مسنده» برقم: 8760، 8907، والطبراني فى «الأوسط» برقم: 3243»