Rawh bin Zinba' (may Allah have mercy on him) relates that he came to Sayyiduna Tamim al-Dari (may Allah be pleased with him) when he was the governor of Bayt al-Maqdis, and he was cleaning barley for his horse. I said: "O governor, did you not have a servant who could have done this work for you?" He said: "Indeed, I heard the Messenger of Allah (peace and blessings be upon him) say: 'Whoever cleans barley for his horse in the way of Allah, then stands by it until he has fed it to it, Allah, the Mighty and Majestic, records for him a good deed for every grain.'"
Imam al-Tabarani (may Allah have mercy on him) said: "Only Ibn Shawdhab narrated this hadith from Ibrahim, and only Ata from Ibn Shawdhab, and Ubayd is alone in narrating it."
Hadith Referenceالمعجم الأوسط / باب الألف / 1133
Hadith Takhrij«أخرجه ابن ماجه فى «سننه» برقم: 2791، وسعيد بن منصور فى «سننه» برقم: 2439، وأحمد فى «مسنده» برقم: 17229، 17230، والطبراني فى «الكبير» برقم: 1254، والطبراني فى «الصغير» برقم: 14»