“I once asked abu ’Abd Allah (a.s.), if there is Zakat on mules. He (the Imam) said, ‘No, Zakat is not due on it.’ I then said, ‘How is it that there is Zakat on horses but not on mules?’ He (the Imam) said, ‘It is because mules do not reproduce but mares do so and Zakat is not due on horses.’ I then asked are donkeys subject to Zakat?’ He (the Imam) said, ‘It is not subject to Zakat.’ I then asked, ‘Are horses and camels that one uses for riding subject to Zakat?’ He (the Imam) said, ‘No, Zakat is not due on whatever one feeds. Only that which is left in pastures land to graze for one year is subject to Zakat, while in one’s possession. Other than this is not subject to Zakat.’”