Those taking the bay'ah are asked to make a sacrifice for the poor, usually in the form of money ($500). Traditionally a sheep is sacrificed to feed the poorest of the poor. In the Holy Land this is the cost of buying, transporting, sacrificing and preparing a sheep in the holy way. For those who can't give the full amount, you give what you can at the time of your promise with a firm intention to pay it off over time. The remainder up to $500 is your debt to Allah. You may pay it in installments until the full amount is paid.