Hazrat Umar bin Abdul Aziz (may Allah have mercy on him) wrote: "Whoever among the people of the land accepts Islam, his family and wealth are protected for him, however, his land and his dwelling will be counted among the spoils (fay’) of the Muslims."
Hadith Referenceسنن سعید بن منصور / كتاب الجهاد / 3772
Hadith Takhrij«أخرجه سعيد بن منصور فى «سننه» ترقيم الدرالسلفية برقم:، 2595، وابن أبى شيبة فى «مصنفه» برقم: 34124»