يَا أَيُّهَا الَّذِينَ آمَنُوا إِن جَاءكُمْ فَاسِقٌ بِنَبَأٍ فَتَبَيَّنُوا أَن تُصِيبُوا قَوْمًا بِجَهَالَةٍ فَتُصْبِحُوا عَلَى مَا فَعَلْتُمْ نَادِمِينَ
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سورة الحُـجُـرات
(49/6) ye who believe! if an evil-doer Came Unto you with a report, then inquire strictly, lest ye hurt a people in ignorance and repent thereafter of that which ye have done.
Surah Al-Hujurat