Abu Hurairah (RA) reported Allah's Apostle (ﷺ) as saying: The servant (who conceals) the faults of others in this world, Allah would conceal his faults on the Day of Resurrection.
Hadith ReferenceSahih Muslim / The Book of Virtue, Enjoining Good Manners, and Joining of the Ties of Kinship / Hadith: 2590