Abd al-Rahman bin Ghanm (may Allah have mercy on him) says: When the people of Syria made peace, I wrote a letter for Umar bin al-Khattab (may Allah be pleased with him): "Bismillahir-Rahmanir-Rahim (In the name of Allah, the Most Gracious, the Most Merciful). This is a letter to the Commander of the Faithful, Umar (may Allah be pleased with him), from the Christians of such-and-such a city. When you came to us, we asked you for safety for ourselves, our children, our wealth and the people of our religion. And we stipulated that we would not build any place of worship, monastery or monk's cell in our city or around it; nor would we rebuild what has fallen into ruin; nor would we revive any of them that lie within the Muslims' quarters; nor would we prevent any Muslim from staying in our churches at any time of day or night; we would keep our doors wide open for passers-by and travellers; we would host Muslims who pass by us for three days and feed them; we would not shelter any spy in our houses or places of worship, nor conceal any treachery against the Muslims; nor would we teach our children the Qur'an. We would not display polytheism nor invite anyone to it, nor would we prevent any of our relatives from accepting Islam if he wishes. We would honour the Muslims. When they wish to sit in our gatherings, we would rise for them. We would not imitate the Muslims in their dress, caps, turbans, shoes or hair. We would not speak as they speak, nor would we adopt their kunyahs. We would not ride on saddles, nor hang swords on ourselves. We would not take up any weapon, nor carry it with us. We would not engrave Arabic on our seals, nor would we sell wine. We would shave the front of our heads, and we would keep to our own (distinctive) dress wherever we are. We would tie girdles (zunnar) around our waists. We would not display our crosses or our books in the Muslims' markets or roads, nor would we place crosses on our places of worship. We would not strike the clapper-bell (naqus) in our places of worship in the presence of Muslims. We would not hold our festival processions, nor bring out the Ba'uth, nor raise our voices over our dead. We would not carry fire with us along the Muslims' roads. We would not bury our dead near them. Nor would we take slaves on whom the shares of the Muslims have fallen. We would be well-wishers to the Muslims and would not look into their homes." When I brought the letter to Umar (may Allah be pleased with him), there was this addition in it: "We will not strike any Muslim. We have made all this binding upon ourselves and the people of our religion for them, and we have accepted safety in return. Then, if we violate any of the conditions we have set, we shall have no covenant of protection, and it will be lawful for you to do with us all that is lawful against people of obstinacy and wretchedness."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجزية / 18717