“Once we were in Makkah and animal for offering became very expensive. We bought for one dinar then, two dinar and then we could not find anything for less or more. Hisham al-Mukariy then wrote a note to abu al-Hassan (a.s.), and informed him (the Imam) of what we had bought and then could not find anything for less or more. He (the Imam) then wrote, ‘Consider the first, second and third prices, then give in charity one-third of the average of such prices.’”