If any of you is assigned by us to a position but conceals a needle or more from us, it will amount to misappropriation and he will be called upon to restore it on the Day of Judgment

عن عدي بن عميرة الكندي رضي الله عنه مرفوعاً: «من اسْتَعْمَلْنَاهُ منكم على عمل، فكَتَمَنَا مِخْيَطًا فما فوقه، كان غُلُولا يأتي به يوم القيامة». فقام إليه رجلٌ أسودُ من الأنصار، كأني أنظر إليه، فقال: يا رسول الله، اقبل عني عَمَلَكَ، قال: «وما لك؟» قال: سمعتك تقول كذا وكذا، قال: «وأنا أقوله الآن: من اسْتَعْمَلْنَاهُ على عمل فلْيَجِيْء بقليله وكثيره، فما أُوتِيَ منه أَخَذَ، وما نهي عنه انْتَهَى».

‘Uday ibn ‘Umayrah (may Allah be pleased with him) reported that the Messenger (may Allah's peace and blessings be upon him) said: "If any of you is assigned by us to a position but conceals a needle or more from us, it will amount to misappropriation and he will be called upon to restore it on the Day of Judgment." A black man from the Ansār stood up - I can still see him - and said: "O Messenger of Allah, take back your assignment from me." The Prophet (may Allah's peace and blessings be upon him) said: "What has happened to you?" The man replied: "I heard you say such-and-such." The Prophet replied: "I say that even now: Whosoever from you is appointed by us to a position, he should render an account of everything, big or small, and whatever he is given therefrom, he should take, and he should desist from taking what is unlawful."

Source · Narrated by Muslim

From the Hadith Encyclopedia (hadeethenc.com).