Musannaf Ibn Abi Shaybah

It is narrated from Hazrat Asma bint Yazid (may Allah be pleased with her) that the Noble Prophet (peace and blessings be upon him) said: Whoever keeps a horse for jihad and spends on it with the intention of reward, then its eating to fullness, its hunger and thirst, its dung and urine will be weighed in his record of deeds on the Day of Judgment (in the record of good deeds). And whoever keeps a horse for show and ostentation, then on the Day of Judgment it will be a cause of failure in his record of deeds.