Cover people's faults and Allah will cover yours. The Prophet ﷺ said: “No servant conceals another servant in this world but Allah conceals him on the Day of Resurrection.” (Muslim). And: “Whoever conceals a Muslim, Allah conceals him in this world and the next.” (al-Bukhārī & Muslim).
العربية: عن ابن عمر رضي الله عنهما أنّ رسول الله ﷺ قال: «ومَن سَتَر مسلمًا سَتَره الله يوم القيامة». (البخاري ومسلم).
When you learn of someone's slip (not a public harm), conceal it — and Allah will conceal yours.