Hawzah News Agency – The merciful prophet of Islam, peace be upon him and his household says:

مَن عَلِمَ مِن أخيهِ سَيِّئَةً فسَتَرَها، سَتَرَ اللَّهُ عَلَيهِ يَومَ القِيامَةِ.

‘He who knows a fellow brother’s evil deed and conceals it [from others], Allah will conceal his faults on the Day of Resurrection.’

Source: al-Targhib wa al-Tarhib, v. 3, p. 239, no. 7