يَا أَيُّهَا الَّذِينَ آمَنُوا إِنْ جَاءَكُمْ فَاسِقٌ بِنَبَإٍ فَتَبَيَّنُوا أَنْ تُصِيبُوا قَوْمًا بِجَهَالَةٍ فَتُصْبِحُوا عَلَىٰ مَا فَعَلْتُمْ نَادِمِينَ

O you who believe! If an evil-doer comes to you with a report, scrutinise it, lest you harm a people in ignorance and later be of the penitent one over what you have done.

[Surat al-Hujuraat 49:6]