It is narrated from Sayyiduna Uqbah bin Amir (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "Whoever sees a fault in his brother and conceals it, Allah Almighty will conceal his fault and admit him into Paradise."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 14867