Sayyiduna Adi bin Amirah (may Allah be pleased with him) said: I heard the Messenger of Allah (peace and blessings be upon him) say: "O people! Whoever does any work for us and then conceals even a needle, he will bring it on the Day of Resurrection." A man of the Ansar spoke, as if I can see him now; he said: "O Messenger of Allah! Take back your work from me." He (peace and blessings be upon him) asked: "What is the matter with you?" He said: "I heard you say this." He (peace and blessings be upon him) said: "I say it even now: whoever is made a collector, let him bring everything, little or much; then whatever he is given from it he may take, and whatever he is forbidden he must refrain from."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب آداب القاضي / 20475