It is narrated from Sayyiduna Buraydah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said about the people of the covenant (dhimmis): "Whatever land, slaves and livestock they owned at the time they accepted Islam will remain theirs, and nothing is due from them on any of these things except sadaqah (zakah)."
Imam al-Tabarani (may Allah have mercy on him) said: "No one narrated this hadith from Alqamah bin Marthad (may Allah have mercy on him) except Layth bin Abi Sulaym, and Musa bin A'yan is alone in narrating it."
Hadith Referenceالمعجم الأوسط / باب الميم / 5074
Hadith Gradingمحدثین:فيه ليث بن أبي سليم، وهو مدلس
Hadith Takhrij«قال الهيثمي: فيه ليث بن أبي سليم وقد وثق ولكنه مدلس «مجمع الزوائد ومنبع الفوائد، ج 3، ص 63»» «أخرجه البيهقي فى «السنن الكبرى» برقم: 7594، 18328، وأحمد فى «مسنده» برقم: 23487، والبزار فى «مسنده» برقم: 4378»