أَيُّهَا الَّذِينَ آمَنُوا إِن جَاءكُمْ فَاسِقٌ بِنَبَأٍ فَتَبَيَّنُوا أَن تُصِيبُوا قَوْمًا بِجَهَالَةٍ فَتُصْبِحُوا عَلَى مَا فَعَلْتُمْ نَادِمِينَ
(6. O you who believe! If a rebellious evil person comes to you with a news, verify it, lest you harm people in ignorance, and afterwards you become regretful to what you have done.)
Investigating the Reliability of the News conveyed by Wicked People
Allah the Exalted ordered investigating the news that sinners and the wicked bring, to make sure of its authenticity. Otherwise, if the sinner's word is taken for granted and a decision is based on it, regardless of whether the information is true or not, the authorities will be taking the lead of the sinners. Allah the Exalted and Most Honored forbade taking the path of the corrupted and sinners. This is why groups of the scholars of Hadith refuse to accept narrations from narrators whose reliability is unknown, for they might be from among the wicked people, in reality.