Sayyiduna Abu Malik al-Ash'ari (may Allah be pleased with him) narrates: I said: O Messenger of Allah, what is the completion of righteousness? He (peace and blessings be upon him) said: "That you do in secret the same deeds you do openly."
Hadith Referenceالمعجم الكبير للطبراني / باب الحاء / 3407