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RAHMADONA. 2022. NIM, HES 222022011 Thesis title "Buying and selling goods that you don't yet own (Study of Product Offerings via WhatsApp Groups in Sawahlunto City)". Sharia Economic Law Postgraduate Program, State Islamic University (UIN) Batusangkar. The main problem in this thesis starts from the buying and selling carried out by the second seller without owning the product which he offers via the Whatsapp group. The product offering is carried out by sharing product posts in the Whatsapp group without permission from the first seller as the owner of the Batik Arang and Sembako products, then buying and selling What the seller does is bending in buying and selling to get customers and profits in his business. The aim of this research is to determine the product offering process and the extent to which the practice of buying and selling goods that are not yet owned complies with the principles of sharia economic law, via WhatsApp in Sawahlunto City. in Sawahlunto City, it is included in prohibited buying and selling which is classified as Fasid This research was conducted in the field with a descriptive qualitative approach. Data was collected through interviews and screenshots of conversations in WhatsApp groups with owners, sellers and buyers. Data analysis uses the Milles and Huberman method. The research results show that the process of offering products via Whatsapp in Sawahlunto City has several steps: 1) Create a Whatsapp group. 2) Share images and videos. 3) Offer products. 4) Respond to offers. 5) Carrying out buying and selling transactions. In this process, violations were discovered related to ownership of goods that were not yet owned by the seller, which could be considered fraud. Apart from that, there are also cases of cornering in buying and selling, where the second seller tries to attract buyers from the first seller in an unfair way. The conclusion of this research is that this kind of buying and selling practice is not in accordance with Islamic teachings because it involves fraud. Therefore, fraud in buying and selling must be avoided because it can harm other parties. Justice and honesty in business are very important, in accordance with religious teachings confirmed by the hadith of the Prophet and the Qur’an.