Why did the church send priest and Friars to find to find heretics In medieval times?

In medieval times, the Church sent priests and friars to find heretics to maintain religious orthodoxy and protect the integrity of Christian teachings. Heresy was seen as a direct threat to the unity of the Church and society, potentially leading to moral decay and social unrest. By identifying and addressing heretical beliefs, the Church aimed to preserve its authority and ensure the salvation of souls. This effort often led to inquisitions and severe punishments for those deemed heretics.