Sayyiduna Adi bin Amirah al-Kindi (may Allah be pleased with him) said: The Prophet (peace and blessings be upon him) addressed us and said: "O people! Whoever among you we appoint to a task, and he then conceals from us a needle or anything greater than that, it is embezzlement which he will bring with him on the Day of Resurrection." At this a black man from the Ansar stood up - it is as though I am looking at him even now - and said: O Messenger of Allah! Take back your assignment from me. He (peace and blessings be upon him) said: "What is the matter?" He said: It is what I heard you (peace and blessings be upon him) say just now. He (peace and blessings be upon him) said: "And I still say it: whoever among you we appoint to a task, let him bring all of it, little and much; then whatever he is given from it he may take, and whatever he is forbidden he should refrain from."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 14328