Hadith 4:132
Yazid ibn Harun narrated to us, from Shu'bah, from 'Amr ibn Dinar, from a man, from his father, that a man fasted Ramadan while traveling, so 'Umar (may Allah have mercy on him) ordered him to repeat it.
حدثنا يزيد بن هارون عن شعبة عن عمرو بن دينار عن رجل عن أبيه ان رجلا صام رمضان في السفر فامره عمر رحمه الله ان يعيد