The pre-perniciousprocession in the Mandailing custom is a tradition that has hitherto been carried out. This research was conducted to find out how the perception of the community hopes that the traditional pre-marriage procession is carried out, how to implement the pre-wedding procession in Hutaraja Lama Village, The method used in this study uses two theories to analyze this problem, namely using the theory in Islamic law, namely 'urf. Metode qualitative research focused on field research (field research) is descriptive analytical based on data obtained from the field. The public perception of the pre-wedding process is gratitude to Allah STW has provided smoothness and convenience, the implementation of the pre-wedding procession in Hutaraja Lama Village goes through several stages, starting from mangaririt boru, padamos hata, patobang hata, and senior sere. Post-wedding processions such as, marulahari, mangupa-upa and so on, all of this is inseparable from the customs that are still inherent in the Mandailing custom. All traditional practices of Mandailing are inseparable from the role of dalihan na tolu mainly in terms of marriage. The urf included in the Marriage Procession in the Mandailing custom is 'urf fasid which is a rule that applies and is recognized by the community but is contrary to Islamic law.
                        
                        
                        
                        
                            
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