Cover a fault, Allah will cover yours
مَنْ سَتَرَ مُسْلِمًا سَتَرَهُ اللَّهُ يَوْمَ الْقِيَامَةِ
Man satara musliman satarahu-llahu yawma-l-qiyamah.
"Whoever covers [the fault of] a Muslim, Allah will cover him on the Day of Resurrection."
Narrated by Ibn Umar. Sahih al-Bukhari 2442, Sahih Muslim 2580
A short reflection
Gossip is easy. The hadith's promise runs in the opposite direction, conceal, and you'll be concealed when it matters.