A servant's deed is made manifest even if he conceals it

It is narrated from Sayyiduna Uthman bin Affan (may Allah be pleased with him) that he said: "If a man were to enter a house (a room) lying in the innermost part of another house and persistently do some deed there, it would not be long before people began to talk about it. And there is no doer who does a deed except that Allah Almighty clothes him in the cloak of that deed: if the deed is good, its recompense and mark are good, and if the deed is evil, its recompense and mark are evil."
This report is established from Sayyiduna Uthman bin Affan (may Allah be pleased with him) as mawquf with a good (jayyid) chain; its basic purpose is to make clear that no hidden deed of a person is concealed from Allah Almighty, and that He makes its effects manifest before the people.

It is narrated from Abd al-Rahman bin Abi Layla that Sayyiduna Abu al-Darda' (may Allah be pleased with him) wrote to Maslamah bin Mukhallad (may Allah be pleased with him): "To proceed: the reality is that when a servant does deeds of obedience to Allah, the Mighty and Majestic, Allah, the Blessed and Exalted, comes to love him, and when Allah loves him, He makes him beloved to His creation as well. And indeed, when a servant does deeds of disobedience and sin against Allah Almighty, Allah, the Mighty and Majestic, becomes displeased with him and detests him, and when Allah Almighty detests him, He makes him detested and disliked in the eyes of His creation as well."
Imam al-Bukhari recorded this hadith in al-Adab al-Mufrad (449), and its chain is sahih (authentic).