Abu Hurrah al-Raqashi (may Allah have mercy on him) narrates from his paternal uncle (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "The property of a Muslim is not lawful except with his consent."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الغصب / 11545