Currently, the need for authentic certificates as evidence is increasing along with the increase in business relationships in various business fields, both on a local and international scale. Most people acquire land by buying and selling. In preventing land problems so that conflicts do not occur in the community, it is necessary to have regulation, control and use of land regulated in the BAL. This study uses a normative juridical law approach with sufficient literature so that secondary data is also needed. The theory of legal certainty is also discussed in this study, because it is fair and implemented normatively, not sociologically. The Civil Code, the sale and purchase of land is essentially a transfer of land rights to other parties/persons in the form of land sellers to land buyers. Buying and selling in customary law is a legal act of transferring land rights by paying the price at the same time in cash.