<![CDATA[Buying and selling agreements (al-bay') are the cornerstone of the Islamic economic system, governing the exchange of goods and services. This article comprehensively discusses the buying and selling agreement from the perspective of Islamic economics, covering its definition, legal foundations, fundamental principles, pillars and conditions, types of agreements, and the wisdom behind its regulation. Using a normative-analytical approach with library research method, this article examines how the principles of justice, honesty, and public interest (maslahah) serve as the spirit of every Islamic transaction. The discussion is also extended to the implementation of buying and selling agreements in the digital era, including the challenges and solutions offered based on sharia principles. The DSN-MUI Fatwa No.146/DSN-MUI/XII/2021 concerning online shops serves as a crucial foundation in analyzing the adaptation of sale and purchase agreements to technological developments. This article concludes that the buying and selling agreement in Islam is not merely a formal legal instrument but a value system that integrates spiritual, moral, and material aspects to realize fair, transparent, and blessed transactions.]]>
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