‘Umar رضي الله عنه said:

“Beware of mentioning others [in your conversations, i.e. backbiting], for it is an illness, and hold fast to the remembrance of Allāh, for it is indeed a cure.” [1]

[1] Al-Qurṭubī

قال عمرُ رضي الله عنه: “إيّاكم وذكرَ النّاس فإنّه داء، وعليكم بذكر الله فإنّه شفاء.”