Do not be quick in accepting the words of a talebearer, even if he resembles the good advisers, for indeed the slanderer oppresses the one whom he slanders [about] and deceives the one whom he slanders to
المصدر : غرر الحكم ودرر الكلم
لَا تَجْتَمِعُ أَمَانَةٌ وَنَمِيمَةٌ
Trustworthiness and talebearing do not go together