The aim of the article is to discuss the crime against the sixth commandment of the decalogue committed by a clergyman with a minor, showing who may be the perpetrator and the aggrieved, which is the subject of the crime under art. 6 § 1 point 1 SST/2019, what is the penalty and when is the statute of limitations. The state legislator also provided legal protection to minors against sexual abuse, hence it is necessary to cooperate between the Church and the laity in this regard. The article describes and discusses the different stages of a preliminary investigation, focusing on the responsibilities of the investigator, what procedural steps to follow, and what to include in the preliminary investigation file. The above subject matter has been discussed taking into account universal and particular laws regulating the above issues.