Arbun (Earnest Money) is a down payment made by a buyer to a seller as a guarantee to complete a transaction. Its permissibility is a topic of "Fiqh" in "Muamalat" (transactions). For the "Ummah," the rules of Arbun ensure that trade is conducted with "Adl" (justice) and that the rights of both parties are protected. It reflects the Islamic emphasis on "Sidq" (truthfulness) and "Amanah" (trust) in business, ensuring that economic life is built on clear commitments and mutual "Rida" (pleasure). Arbun, in Islamic commercial law (Muamalat), refers to an "earnest money" contract or a down payment. It occurs when a buyer pays a small portion of the purchase price to a seller as a deposit to secure an asset. If the sale is completed, the Arbun is deducted from the final price; however, if the buyer decides not to proceed, the seller may keep the deposit as compensation for the time the item was off the market. While there has been historical debate among different schools of jurisprudence (Madhhabs) regarding its validity, it is widely used in modern Islamic finance to facilitate transactions and ensure commitment between parties in various trading agreements. The permissibility of arbun is debated. Some scholars allow it, considering it a form of compensation for the seller's loss of opportunity. Others consider it invalid, as it resembles gambling (qimar) or unjust enrichment. Modern Islamic finance often permits arbun with conditions: the deposit must be reasonable; the buyer must have the option to complete or cancel; the seller may keep the deposit only to compensate for actual loss. For believers, arbun is used in transactions to show good faith. They ensure the terms are clear, the deposit is reasonable, and both parties agree. They conduct business with honesty and fairness, seeking Allah's pleasure in their trade.