It wasnarrated from Abu Hurairah that the Messenger of Allah (ﷺ)said:
"There is goodness in the forelocks of horses" – or he said:"There is goodness tied in the forelocks of horses." Suhail (oneofthe narrators) said: "I am not certain of" – "until theDay ofResurrection. And horses are of three types: those that bringrewardto a man, those that are a means of protection for a man, andthosethat are a burden (of sin) for a man. As for those that bringreward,a man keeps them in the cause of Allah and keeps themconstantly ready(for Jihad), so they do not take any fodder intotheir stomachs but areward will be written for him, and if he putsthem out to pasture,they do not eat anything but reward will bewritten for him. If hegives them to drink from a flowing river, forevery drop that enterstheir stomachs there will be reward,"(continuing) until he mentionedreward in conjunction with theirurine and droppings, and even whenthey run here and there bythemselves, for each step they take areward will be written for him– 'As for those that are a means ofprotection, a man keeps thembecause they are a source of dignity andadornment, but he does notforget the rights of their backs andstomachs (i.e., their right notto be overworked and their right to befed) whether at times of theirdifficulty or ease. As for those thatbring a burden (of sin), theone who keeps them for purposes ofwrongdoing or for pomp and showbefore people, is the one for whomthey bring a burden of sin."
English reference: Vol. 4, Book 24, Hadith 2788
Arabic reference: Book 24, Hadith 2894